Water Commission

AGENDA OF THE WATER COMMISSION MONDAY, JANUARY 12, 2026, 8:30 AM In person at the Green Bay Water Utility. 631 S Adams St Virtual attendance is also available via Zoom. A. Zoom Meeting Information. 1. Join Zoom Meeting Online: https://zoom.us/j/98284055918?pwd=eHBxaWkvN1J2a3N0RERUWkRsNjVkUT09 Or call in by phone: +1 312 626 6799 Meeting ID: 982 8405 5918 Passcode: 385002 If you wish to leave a comment for this public meeting, please fill out the online Comment Form prior to the meeting. More detailed Zoom Instructions can be found online. B. Roll Call. 1. Members: John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, William Morgan, John Luczaj C. Approval of the Agenda. 1. Approval of the agenda for the Monday, January 12, 2026, meeting of the Water Utility Commission. D. Approval of Minutes. 1. Approval of the minutes from the December 8, 2025 meeting. E. Regular Business. 1. Public Hearing on Water Supply Service Area Plan. Green Bay Water Utility has prepared a Water Supply Service Area Plan as required by the Wisconsin Department of Natural Resources under NR 854. As a general planning document, the purpose is to provide basic information to the public and communities about Green Bay Water's sources and ability to Agenda of the Water Commission January 12, 2026 Page 1  meet current and projected future water demands. The plan uses a 20-year planning period (2025-2045). 2. Approval of the Water Supply Service Area Plan with Incorporated Public Comments. 3. Introduction of new employee, Clara Pickett, Business Manager. 4. November 2025 Financial Report F. Informational. 1. General Manager Update G. Adjournment. 1. Adjournment of the Monday, January 12, 2026, meeting of the Water Utility Commission. 1) ACCESSIBILITY: Any person wishing to attend who requires special accommodation because of a disability, should contact the City Safety Manager at 920-448-3125 at least 48 hours before the scheduled meeting time so that arrangements can be made. 2) QUORUM: Please take notice that a majority or quorum of the Common Council may attend this Water Commission meeting and will constitute a meeting of the Common Council for purposes of discussion and information gathering relative to this agenda. 3) REPRESENTATION: The party requesting the communication, or their representative, should be present at this meeting. Agenda of the Water Commission January 12, 2026 Page 2  MINUTES OF THE WATER COMMISSION MONDAY, DECEMBER 8, 2025, 8:30 AM In person at the Green Bay Water Utility. 631 S Adams St Virtual attendance is also available via Zoom. A. ZOOM MEETING INFORMATION. 1. Join Zoom Meeting Online: https://zoom.us/j/98284055918?pwd=eHBxaWkvN1J2a3N0RERUWkRsNjVkUT09 Or call in by phone: +1 312 626 6799 Meeting ID: 982 8405 5918 Passcode: 385002 If you wish to speak at this public meeting or leave a comment, please fill out the online Comment Form prior to the meeting. More detailed Zoom Instructions can be found online. B. ROLL CALL. 1. Members: John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, William Morgan, John Luczaj Present: John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj Also present: Alder Bill Morgan (non-voting), Council Representative to the Water Commission, and Attorney William Vande Castle. C. APPROVAL OF THE AGENDA. 1. Approval of the agenda for the Monday, December 8, 2025, meeting of the Water Utility Commission. Moved by Jamie Wall, seconded by Lynn Gerlach to approve the agenda. Motion Passed. Yes-John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj, No-None, Abstain-None. D. APPROVAL OF MINUTES. 1. Approval of the minutes from the November 10, 2025 meeting. Moved by Lynn Gerlach, seconded by Jamie Wall to approve the minutes. Motion Passed. Yes-John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj, No-None, Abstain-None. E. REGULAR BUSINESS. 1. Introduction of new employee, Nicholas Wirgau, Safety Coordinator. The Water Commissioners welcomed Nicholas Wirgua to the Green Bay Water Utility. 2. Approval of 2026 Commission Dates. Moved by Lynn Gerlach, seconded by Thomas Karman to approval of the 2026 Commission dates. Motion Passed. Yes-John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj, No-None, Abstain-None. 3. October 2025 Financial Report Moved by Thomas Karman, seconded by Jamie Wall to approve as presented. Motion Passed. Yes-John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj, No-None, Abstain-None. 4. Approval and Adoption of the Resolution for the 2026 Annual Budget. Moved by Thomas Karman, seconded by Jacque Boyle to approve and adopt the Resolution for the 2026 Annual Budget.  Motion Passed. Yes-John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj, No-None, Abstain-None. 5. Approval of the Water Service Agreement By and Between the City of Green Bay, the Village of Hobart and the Village of Pulaski. Moved by John Luczaj, seconded by Lynn Gerlach to approve the resolution as presented. Motion Passed. Yes-John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj, No-None, Abstain-None. 6. Approval of Moving the Filter Plant Manager into the Operations Section. Moved by Jamie Wall, seconded by Allen Farvour to approve as presented. Motion Passed. Yes-John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj, No-None, Abstain-None. 7. Approval of the Water Supply Service Area Plan. Moved by John Luczaj, seconded by Jamie Wall to approve the Water Supply Service Area Plan. Motion Passed. Yes-John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj, No-None, Abstain-None. F. INFORMATIONAL. 1. General Manager Update General Manager Brian Powell provided the commission with updates on the following initiatives within our organization: 1. Update on Partnership for Safe Water 2. Update on 36-inch Pipe Segment Repairs 3. Workforce Report a. Business Manager - Starting December 15th b. Filter Plant Manager - Advertised November 25th G. ADJOURNMENT. 1. Adjournment of the Monday, December 8, 2025, meeting of the Water Utility Commission. Moved by Jamie Wall, seconded by Thomas Karman to adjourn. Motion Passed. Yes-John Heugel, Jamie Wall, Jacque Boyle, Thomas Karman, Allen Farvour, Lynn Gerlach, John Luczaj, No-None, Abstain-None. WATER SUPPLY SERVICE AREA PLAN GREEN BAY WATER UTILITY GREEN BAY, WISCONSIN DECEMBER 2025 TABLE OF CONTENTS Introduction ................................................................................................................................................. 3 Background ............................................................................................................................................. 3 Purpose ..................................................................................................................................................... 3 SECTION 1 – Define Planning Period ......................................................................................................... 4 SECTION 2 – Delineate Service Area ........................................................................................................ 4 SECTION 3 – Describe Public Water Supply System ................................................................................ 6 Water Sources.......................................................................................................................................... 6 Consecutive Systems .............................................................................................................................. 7 Location in Great Lakes Basin................................................................................................................ 7 SECTION 4 – Describe Withdrawal From Water Supply .......................................................................... 8 SECTION 5 – Describe Existing Water Use ................................................................................................. 8 SECTION 6 – Describe Projected Water Demand ................................................................................. 10 SECTION 7 – Alternate Water Sources .................................................................................................... 11 Lake Michigan Supply .......................................................................................................................... 11 Filter Plant............................................................................................................................................ 11 Lake Pump Station............................................................................................................................. 12 Storage ............................................................................................................................................... 12 Emergency Supply ................................................................................................................................ 12 SECTION 8 – Plan Recommendations..................................................................................................... 13 SECTION 9 – Consistency with Existing Plans/Agreements ................................................................... 13 SECTION 10 – Public Participation ........................................................................................................... 13 Summary of Written Comments .......................................................................................................... 14 Summary of Public Hearing Comments ............................................................................................. 14 SECTION 11 – Plan Submittal .................................................................................................................... 14 SECTION 12 – Plan Updates ..................................................................................................................... 14 Appendix A................................................................................................................................................ 15 2 INTRODUCTION BACKGROUND 1 The City of Green Bay is a community of approximately 107,395 persons located in northeastern Wisconsin in Brown County. The City is located at the head of the Bay of Green Bay, a sub-basin of Lake Michigan, at the mouth of the Fox River and is approximately 120 miles north of the City of Milwaukee. The Green Bay Water Utility’s retail service area, which is the City of Green Bay, is the third most populous city in Wisconsin, and has continued to experience substantial growth in population and tax base. The City has become one of the Wisconsin’s predominate manufacturing areas with particular emphasis on the nondurable goods industries. The Green Bay Water Utility is Wisconsin’s third largest drinking water supplier and provides wholesale service to the Village of Ashwaubenon (since June 2006), Town of Scott (since October 2006), the Village of Hobart (since June 2011), and the Village of Wrightstown (since July 2016). The Green Bay Water Utility draws its water from Lake Michigan 20 miles to the east of the City of Green Bay, just north of the City of Kewaunee. Water is pumped from Lake Michigan via dual transmission mains (42-inch and 54-inch) to the Filter Plant approximately 6 miles east of the City. From the Filter Plant the water is supplied to the city via two 36-inch transmission mains which supply 7 pressure zones, and 4 wholesale customers. The Green Bay Water Utility maintains 8 groundwater wells to provide an emergency backup water supply, 5 water storage tanks in distribution system (elevated and ground), and approximately 514 miles of transmission and distribution mains, ranging in size up to 54 inches in diameter. The customers of the Green Bay Water Utility include major industrial water users, along with smaller industrial and numerous commercial and residential users. Industrial customers (40 percent), residential (21 percent), and wholesale customers (24 percent) accounted for approximately 84 percent of the total water consumption in 2023 with multi-family, commercial and public customers accounting for the remaining 16 percent. PURPOSE The Wisconsin Department of Natural Resources (WDNR) requires a Water Supply Service Area Plan for all public water supply systems that serve a population of 10,000 or more and withdraw water from the waters of the state, which includes Green Bay Water Utility (PWS ID 40503562). In recent years, Green Bay Water Utility (GBW) has prepared plans that evaluate water needs and short- and long-term system improvements required to serve current and future utility customers. These plans were prepared by AECOM in conjunction with staff at GBW, titled “Water System Master Plan” and a subsequent “Water System Master Plan Update,” dated December 2017 and January 2025, respectively. The specific planning information required for the WDNR Water Supply Service Area Plan is contained in detail in these already prepared plans and will be 1 AECOM (January 2025). Water System Master Plan Update. Chapter 1 3 referenced directly. This report compiles information from previously prepared plans as well as supplemental information specific to water service area to demonstrate compliance with Wisconsin Statutes NR 854 as follows: • Define the planning period for the GBW service area • Identify the existing and projected GBW service area • Inventory existing water supply sources • Inventory of consecutive water systems • Identify average daily demand • Describe existing water use • Identify alternate water sources • Project water demand • Recommend how to meet projected water demand The Water Supply Service Area Plan will also demonstrate that the existing and projected water supply service area for Green Bay Water Utility is entirely contained within the Great Lakes Basin, and no new diversion of Great Lakes water is anticipated. SECTION 1 – DEFINE PLANNING PERIOD The Water Service Supply Area Plan is based on a 20-year planning period, from 2025 to 2045. This planning period projects future pumping based on historical water system pumpage data from 2000 to 20252, as well as development and population growth3. SECTION 2 – DELINEATE SERVICE AREA Green Bay Water Utility currently provides retail water service to the City of Green Bay, plus four wholesale customers (consecutive systems): • Village of Ashwaubenon (since 2006) • Town of Scott (since 2006) • Village of Hobart (since 2011) • Village of Wrightstown (since 2016) GBW has identified three additional communities that have expressed interest in potential service from GBW and are included in future projections and growth for GBW water supply area within the planning period: • Village of Pulaski (anticipated 2026) • Village of Luxemburg • Town of Pittsfield Projected growth for the water system within the planning period includes (1) future changes in City of Green Bay service area population, (2) future changes in wholesale customer 2 AECOM (January 2025). Water System Master Plan Update. Figure ES-1 Historical and Projected Average Day Pumpage 3 AECOM (January 2025). Water System Master Plan Update. Table ES-1 Future Pumpage Projections 4 populations, and (3) expansion of service area with the addition of wholesale customers in the future. Population projections were based on Wisconsin Department of Administration (DOA) and U.S. Census Bureau, based on average increases over the last 10 years. A full analysis of the data and assumptions of the City of Green Bay population trends and projections, plus existing and potential future wholesale customer populations is contained within Chapter 2 of the Water System Master Plan Update dated January 2025. This population projection considers land use and potential areas of future development within existing and future service areas. The Town of Pittsfield population was not included in the Water System Master Plan Update dated January 2025 since the community does not yet have a public water system. However, since the completion of the Water System Master Plan Update, the Village of Pulaski entered an agreement to purchase water from GBW starting in 2026 and developed a memorandum of understanding with the adjacent Town of Pittsfield to allow future potential conveyance of water. The current population of Pittsfield is estimated at 2,833, which has increased by 1.5% since the 2020 Census.4 This population is similar in magnitude to the 2025 population listed in Table 2-2 of the Water System Master Plan for Village of Luxemburg at 2,914.5 GBW’s existing and future service area abuts a separate water supply of Central Brown County Water Authority (CBCWA). The CBCWA supplies drinking water to the following communities that comprise the Authority which have an agreement with the City of Manitowoc and the Manitowoc Public Utilities to obtain water from Lake Michigan: • City of De Pere • Village of Allouez • Village of Bellevue • Village of Denmark • Village of Howard • Town of Lawrence • Town of Ledgeview These communities are not included in future demand projections or included in GBW’s Water Service Supply Area Plan under normal or emergency conditions. A map showing the future water supply service area of GBW is shown in Appendix A at the end of this plan (labeled Figure 2-36). The existing and future water supply service area is entirely contained within the Great Lakes basin. 4 “Official Final Estimates, 1/1/2025, Wisconsin Municipalities, with Comparison to Census 2020”, Wisconsin Demographic Services Center, Wisconsin Department of Administration (DOA) 5 AECOM (January 2025). Water System Master Plan Update. Table 2-2 Summary of Population for Existing/Potential Wholesale Customers 6 AECOM (January 2025). Water System Master Plan Update. Figure 2-3 Potential Service Area of Green Bay Water Utility 5 SECTION 3 – DESCRIBE PUBLIC WATER SUPPLY SYSTEM WATER SOURCES Green Bay Water Utility’s main source of water is Lake Michigan via two lake intakes. The water is pumped approximately 17 miles to the Filter Plant through a 42-inch prestressed concrete cylinder pipe installed in 1957 and a 54-inch steel pipe installed in 2006. From the Filter Plant three reservoirs supply water to the City via two 36-inch prestressed concrete cylinder transmission mains (approximately 12 miles). The transmission mains supply water to the various pressure zones in the City and to the wholesale customers (consecutive systems). The distribution system is separated into seven pressure zones to prevent significant topographic fluctuations from providing unacceptable system pressures. The SCADA system allows monitoring of remote facilities and control of some facilities. The Utility has 8 backup wells in the distribution system for emergency supply purposes.7 A full inventory of GBW’s system infrastructure, along with maps and schematics, is contained within Chapter 4 of the Water System Master Plan Update dated January 2025. Lake Michigan source water is considered to be high quality, as it is relatively free from contaminants and common water quality concerns. Routine monitoring shows that levels of impurities are either not detected or well below regulatory thresholds, ensuring the water is safe and reliable for consumption. This natural purity reduces the need for extensive treatment processes, allowing us to deliver clean, clear water that is consistently in compliance with state and federal standards. Water quality naturally experiences seasonal fluctuations in turbidity, pH, and temperature, which are expected variations tied to environmental changes throughout the year. Importantly, the water supply does not require treatment for hardness, and the total organic carbon is consistently low, eliminating any significant issue of chlorination disinfection by-products for this source water. To further safeguard public health and improve aesthetic qualities, ozone treatment was introduced in 2000, effectively inactivating Cryptosporidium while also enhancing taste and odor. GBW began testing the source water for PFAS in 2018 and has not seen a concerning amount of this manufactured substance based on current research. More recently in 2024, EPA announced the maximum allowable concentrations for specific PFAS chemicals: • PFOA and PFOS: 4 parts per trillion (ppt) • PFHxS, PFNA, HFPO-DA (GenX): 10 ppt • Combined Hazard Index for PFBS, PFHxS, PFNA, and HFPO-DA (GenX): 1 7 AECOM (January 2025). Water System Master Plan Update. 6 Our recent testing under the EPA’s "Fifth Unregulated Contaminant Monitoring Rule" confirms that levels of PFAS at our treatment facilities are below these limits. We continue to test for these potential contaminants on a monthly basis. CONSECUTIVE SYSTEMS Green Bay Water Utility currently provides wholesale water to four consecutive systems: • Village of Ashwaubenon (since 2006) • Town of Scott (since 2006) • Village of Hobart (since 2011) • Village of Wrightstown (since 2016) GBW has identified three additional communities that have expressed interest in potential service from GBW and are included in future projections and growth for GBW water supply area within the planning period: • Village of Pulaski (anticipated 2026) • Village of Luxemburg • Town of Pittsfield LOCATION IN GREAT LAKES BASIN GBW’s existing and future service areas are contained entirely within the Great Lakes Basin. 7 SECTION 4 – DESCRIBE WITHDRAWAL FROM WATER SUPPLY Green Bay Water Utility supplies water to the system by withdrawing water from Lake Michigan via two lake intakes. The water is pumped approximately 17 miles to the Filter Plant through a 42- inch prestressed concrete cylinder pipe installed in 1957 and a 54-inch steel pipe installed in 2006. From the Filter Plant three reservoirs supply water to the City via two 36-inch prestressed concrete cylinder transmission mains (approximately 12 miles). The transmission mains supply water to the various pressure zones in the City and to the wholesale customers (consecutive systems). The Utility has 8 backup wells in the distribution system for emergency supply purposes.8 A full inventory of GBW’s system infrastructure, along with maps and schematics, is contained within Chapter 4 of the Water System Master Plan Update dated January 2025. Average daily withdrawal from Lake Michigan is provided in Figure 3-2 and Table 3-11 in the Water System Master Plan Update dated January 2025. For the past 5 years, total pumpage averaged approximately 19.2 million gallons per day (MGD), which is an increase in approximately 6.5 percent from the 18.0 MGD from the years 2012-2017 described in the Water System Master Plan dated December 2017. 9 10 As discussed in Section 7 of this plan, the maximum withdrawal capacity from Lake Michigan is 42 MGD as controlled by the capacity of the Filter Plant. SECTION 5 – DESCRIBE EXISTING WATER USE The existing service area population estimated as of 1/1/2025 is as follows11: • City of Green Bay 107,994 • Village of Ashwaubenon 18,409 • Town of Scott 3,664 • Village of Wrightstown 4,019 • Village of Hobart 11,558 The population density within the existing and projected GBW Water Supply Service Area varies based on census tract. There are areas that have 10,000 or more persons per square mile, and 8 AECOM (January 2025). Water System Master Plan Update. 9 AECOM (January 2025). Water System Master Plan Update. 10 AECOM (December 2017). Water System Master Plan Update. 11 “Official Final Estimates, 1/1/2025, Wisconsin Municipalities, with Comparison to Census 2020”, Wisconsin Demographic Services Center, Wisconsin Department of Administration (DOA) 8 also areas as low as 50 to 99.9 persons per square mile, as shown in the image below: Source: United States Census Bureau, 2020 Census Demographic Data Map Viewer https://maps.geo.census.gov/ddmv/map.html A summary of historic customer water demands and pumpage over the past 27 years is contained entirely within Chapter 3 of the Water System Master Plan Update dated January 2025. Based on this historic data and population projections, future water requirements are estimated. Although total GBW water sales have not varied drastically over the 27-year period, the characteristics of water sales have changed. As residential and industrial water sales have declined, the Green Bay Water Utility began to supply wholesale customers. Over the 27-year period of data summarized in the table, water sales have varied from a low of 5,389 million gallons per year (MGY) in 2005 to a high of 6,665 MGY in 2021. Sales in residential and commercial were generally decreasing throughout the period. Industrial sales were generally decreasing for the period until the recent increases in the past few years. Overall water sales have increased approximately 7 percent from 2015 to 2023 as a result of wholesale customer sales offsetting the decrease in sales to other customers and the increase in industrial sales.12 12 AECOM (January 2025). Water System Master Plan Update. Chapter 3.1.1 9 The historical number of customers served has been relatively constant. Approximately 93 percent of the approximately 36,100 customers are residential and multi-family customers.13 Additional specific information that is required in this water supply service plan is contained entirely within Chapter 3 of the Water System Master Plan Update dated January 2025 and prepared by AECOM: • Number of retail customers purchasing water for residential use, commercial use, industrial use, public authority (Table 3-3) • Sales of water for residential use, commercial use, industrial use, and public authority (Table 3-1, Table 3-2, and Figure 3-1) • Metered water usage for the system’s largest 10 retail customers (Table 3-7) • Metered water sales to consecutive systems for each year since connecting to Green Bay Water (Table 3-8) • Water usage of consecutive systems for the last 27 years (Table 3-9) Seasonal pumpage, system maximum day pumpage, and hourly demand fluctuations are additional factors in the planning for projected water demands. Refer to Chapter 3 of the Water System Master Plan Update for the complete data and discussions of this topic. SECTION 6 – DESCRIBE PROJECTED WATER DEMAND Sales and pumpage projections were based on assumptions of water demand, coupled with estimates of future populations and community and service area growth. The service area includes the existing retail service area for City of Green Bay, existing consecutive systems (Village of Ashwaubenon, Village of Wrightstown, Town of Scott, Town of Hobart), projected population growth of existing retail and consecutive systems, plus the addition of future consecutive systems (Village of Pulaski, Village of Luxemburg, Town of Pittsfield). At the time of the “Water System Master Plan Update” preparation, the Village of Pulaski was a potential wholesale customer. The Village of Pulaski has since entered into an agreement to purchase water from GBW starting in 2026, and has since developed a memorandum of understanding with the adjacent Town of Pittsfield to allow future potential conveyance of water. A detailed summary of the individual components and methods to derive the projected water sales and pumpage requirements is provided in Tables 3-13, 3-14, and 3-16 and discussed in detail in Chapter 3, Section 3.3 of the Water System Master Plan Update, dated January 2025.14 The following highlights describe the projected water demand for the GBW Water Supply Service Area: 1. The projected 2045 average day water requirement is estimated to be approximately 23.2 million gallons per day (MGD). This represents an increase in water requirements of 13 AECOM (January 2025). Water System Master Plan Update. Chapter 3.1.1 14 AECOM (January 2025). Water System Master Plan Update. Chapter 3.3 10  nearly 10 percent from the current average day water requirement of approximately 21.2 MGD.15 16 2. Maximum day pumpage for the Green Bay Water Utility is projected to increase to approximately 37.6 MGD in 2030 and to 37.7 MGD in 2045 based on a maximum day factor of 1.65.17 3. Peak hour demand for the City of Green Bay is projected to increase to approximately 34.9 MGD (24,300 gpm) by 2045 which equates to approximately 44.7 MGD (31,100 gpm) for the Utility by 2045 as peak hour demand for wholesale customers was assumed to come from the wholesale customers’ storage and is not included in the calculation of peak hour demand.18 SECTION 7 – ALTERNATE WATER SOURCES LAKE MICHIGAN SUPPLY Green Bay Water is supplied by Lake Michigan surface water since 1957, having a raw water Lake Pump Station with approximate capacity of 30,000 gpm/43 MGD, and a Filter Plant treatment capacity of 29,000 gpm/42 MGD. Finished water is delivered to the City of Green Bay and to consecutive systems via finished water transmission mains. Three booster stations are in the distribution system, but only operate when higher seasonal demands occur. FILTER PLANT A memorandum prepared by AECOM in February 2017 provides an assessment of the effective capacity of the Filter Plant, unit process by unit process, and future improvement needs is contained in Appendix F in the Water Service Master Plan dated December 2017.19 Section 5.1 of the Water System Master Plan Update dated January 2025 reviews the reliable water supply capacity of Lake Michigan source in detail. The capacity of the raw water pumping, filter plant treatment, hydraulic supply of both the raw and finished water transmission mains are adequate to meet current and projected average and maximum day demands. 15 AECOM (January 2025). Water System Master Plan Update. Executive Summary 16 AECOM (January 2025). Water System Master Plan Update. Chapter 3.7 17 AECOM (January 2025). Water System Master Plan Update. Chapter 3.7 18 AECOM (January 2025). Water System Master Plan Update. Chapter 3.7 19 AECOM (December 2017). Water System Master Plan. Appendix F – Memorandum GBW Treatment Plant Evaluation 11 LAKE PUMP STATION A technical memorandum prepared by HydraTek in August 2023 provides the pump typical operating point as a result of a pump efficiency study at the Lake Pump Station, and resulted in a reliable pump capacity of 43.4 MGD.20 The auxiliary power source for the Lake Pump Station requires improvements to meet the existing and future average day demands. Currently, the existing two diesel generators at the Lake Pump Station can operate 2 pumps (approximately 17 MGD to 18 MGD). The existing and projected future 2045 average day demand are approximately 21 MGD and 23 MGD, respectively. Note, GBW is currently constructing the recommended electrical improvements and an additional standby generator to address this deficiency. The design was completed by Donohue and Associates, Inc and improvements are anticipated to be in service by end of 2026. STORAGE GBW’s Lake Michigan supply includes storage for fire protection, water system pressure establishment and maintenance, operational flexibility, and water supply reliability. The water storage includes 4 MG of available effective storage at the Filter Plant (Tables 5-19 and 5-1021), plus there is additional effective storage capacity in 5 of the 7 pressure zones in the City of Green Bay (Table 5-1122). Section 5.2.2 of the Water System Master Plan Update reviews the available storage capacity for the existing system in detail, and projects 2045 future storage requirements at the Filter Plant. Assuming storage projection for two fires with a maximum fire flow requirement of 3,500 gpm for 180 minutes each and 50 percent of the Filter Plant reservoir volume is available for fire, peak hour, and operation storage and 50 percent for the Filter Plant operation, the system has adequate storage.23 EMERGENCY SUPPLY Green Bay Water Utility was served by groundwater wells prior to 1957 when the water supply was then transitioned to Lake Michigan source. The groundwater wells have remained in the system and maintained for emergency back-up purposes. Eight emergency back-up wells are located in four of the seven pressure zones in the City of Green Bay distribution system and together have a reliable well capacity of 10.23 MGD.24 20 AECOM (January 2025). Water System Master Plan Update. Table 5-2 21 AECOM (January 2025). Water System Master Plan Update. Chapter 5.2 22 AECOM (January 2025). Water System Master Plan Update. Chapter 5.2 23 AECOM (January 2025). Water System Master Plan Update. Appendix C Table 2 24 AECOM (January 2025). Water System Master Plan Update. Table 5-1 12 If water supply cannot be supplied from the Filter Plant: • Bader Pressure Zone and Seventh Pressure Zone have adequate total backup well capacities to meet existing maximum day demands. • John Street Pressure Zone and Hobart Pressure Zone have adequate total capacities to meet existing average day demands. • The remaining pressure zones do not have backup wells.25 SECTION 8 – PLAN RECOMMENDATIONS The Water System Supply Area Plan recommends maintaining the current Lake Michigan water supply and infrastructure to meet existing and projected demands outlined in this plan and as supplemented by the complete data and analyses contained in the “Water System Master Plan” prepared by AECOM in December 2017 and the “Water System Master Plan Update” prepared by AECOM in January 2025. SECTION 9 – CONSISTENCY WITH EXISTING PLANS/AGREEMENTS Green Bay Water Utility has the following plans and agreements that relate to the projected growth area. All documents account for the existing and future projection of water demand described in this Water Supply Service Area Plan. 1. Wholesale agreement between Green Bay Water Utility and Village of Ashwaubenon, 2006 2. Wholesale agreement between Green Bay Water Utility and Town of Scott, 2006 3. Wholesale agreement between Green Bay Water Utility and Village of Hobart, 2011 4. Wholesale agreement between Green Bay Water Utility and Village of Wrightstown, 2016 5. Wholesale agreement between Green Bay Water Utility and Village of Pulaski, 2025 6. Water System Master Plan, 2017, AECOM 7. Water System Master Plan Update, 2025, AECOM SECTION 10 – PUBLIC PARTICIPATION The included Water Supply Service Area Plan has been made available to the public on December 12, 2025, via public notice and www.gbwater.org. Written comments were accepted from the public from December 12 through December 31, 2025. A public hearing on the plan is scheduled for January 12, 2026, Water Commission meeting. The hearing is offered for attendance in-person and online via Zoom. Any comments received at the public hearing will be added to supplement the plan. 25 AECOM (January 2025). Water System Master Plan Update. Appendix C Table 1 13 SUMMARY OF WRITTEN COMMENTS Written comments were welcomed from the public upon notice of the plan. The public could submit the written comments via email or U.S. Mail. The following comments were provided: 1. *this section to be completed on 12/31/25* SUMMARY OF PUBLIC HEARING COMMENTS Comments were welcomed from the public at the public hearing. The following comments were provided: 1. *this section to be completed on 1/12/26* SECTION 11 – PLAN SUBMITTAL This plan has been delivered via U.S. Mail to the following governing bodies whose public water supply is addressed by this plan: • Village of Ashwaubenon • Town of Scott • Village of Hobart • Village of Wrightstown • Village of Pulaski • Village of Luxemburg • Town of Pittsfield SECTION 12 – PLAN UPDATES Green Bay Water Utility’s Water Supply Service Area Plan will be reviewed and updated on a regular 5-year cycle per NR 854.04(5), in conjunction with our regular update to our Water System Master Plan, currently scheduled for 2030. In addition, GBW will monitor changes in water use and update the plan as needed. 14 APPENDIX A 15  Green Bay Water Commission GENERAL MANAGER UPDATE DATE: January 12th, 2026 TO: Green Bay Water Commission FROM: General Manager Brian Powell, P.E. RE: General Manager Update General Manager Brian Powell will provide the commission with updates on the following initiatives within our organization: 1. Update on Intakes at the Lake Station 2. Meghan Finger selected by Greater Green Bay Chamber as a 2026 Future 15 Recipient. 3. River Crossing Leak detected with Fire Department Drone. 4. Workforce Report a. Filter Plant Manager – Held Interviews