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2026 WATER QUALITY RECORDS

Wisconsin Water Quality: 95 Cities Ranked by the Records

Water quality across 95 cities in Wisconsin, drawn from EPA drinking-water records. Each city page shows the measured contaminants and a reproducible Purity Score.

Find your city Why no state score? Water in Wisconsin is delivered by many different systems. PurityMap does not average those local records into a statewide safety verdict.
city reports ranked
95
cities with a past health-based violation
6
cities with PFAS above the federal limit
8
cities with lead above the action level
0

Wisconsin cities ranked by the records

95 cities, highest Purity Score first

  1. 1New Berlin100/100No PFAS detected; lead 0 µg/L
  2. 2Grand Chute Tn San Dist100/100No PFAS detected; lead 0 µg/L
  3. 3Brown Deer Waterworks100/100No PFAS detected; lead 0 µg/L
  4. 4Appleton98/100No PFAS detected; lead 0.97 µg/L
  5. 5Appleton Waterworks98/100No PFAS detected; lead 0.97 µg/L
  6. 6De Pere Waterworks Sa98/100No PFAS detected; lead 1.1 µg/L
  7. 7Caledonia98/100No PFAS detected; lead 2 µg/L
  8. 8Onalaska Waterworks98/100No PFAS detected; lead 1.49 µg/L
  9. 9Ashwaubenon Waterworks98/100No PFAS detected; lead 1.6 µg/L
  10. 10Menasha Elec Util98/100No PFAS detected; lead 1.1 µg/L
  11. 11Greendale Waterworks98/100No PFAS detected; lead 1.8 µg/L
  12. 12Allouez Waterworks98/100No PFAS detected; lead 1.2 µg/L
  13. 13Darboy Sanitary Dist98/100No PFAS detected; lead 2 µg/L
  14. 14Glendale Waterworks98/100No PFAS detected; lead 1.7 µg/L
  15. 15Mequon98/100No PFAS detected; lead 2 µg/L
  16. 16Pleasant Prairie98/100No PFAS detected; lead 2 µg/L
  17. 17Sparta Waterworks98/100No PFAS detected; lead 2 µg/L
  18. 18Howard Waterworks97/100No PFAS detected; lead 2.4 µg/L
  19. 19Kaukauna97/100No PFAS detected; lead 2.4 µg/L
  20. 20River Falls Waterworks97/100No PFAS detected; lead 2.3 µg/L
  21. 21Green Bay96/100No PFAS detected; lead 2.6 µg/L
  22. 22Green Bay Waterworks96/100No PFAS detected; lead 2.6 µg/L
  23. 23Sheboygan96/100No PFAS detected; lead 3.5 µg/L
  24. 24Franklin96/100No PFAS detected; lead 2.8 µg/L
  25. 25Chippewa Falls Waterworks96/100No PFAS detected; lead 2.7 µg/L
  26. 26Marinette Waterworks96/100No PFAS detected; lead 3.1 µg/L
  27. 27Oak Creek Waterworks95/100No PFAS detected; lead 4 µg/L
  28. 28Stevens Point Waterworks95/100No PFAS detected; lead 4.29 µg/L
  29. 29Fitchburg Dist95/100No PFAS detected; lead 3.8 µg/L
  30. 30Bellevue Waterworks95/100No PFAS detected; lead 3.7 µg/L
  31. 31Verona Waterworks95/100No PFAS detected; lead 4.2 µg/L
  32. 32Fox Crossing West95/100No PFAS detected; lead 4.3 µg/L
  33. 33Baraboo Waterworks95/100No PFAS detected; lead 3.6 µg/L
  34. 34Cedarburg L W Commission95/100No PFAS detected; lead 3.8 µg/L
  35. 35Grafton Waterworks95/100No PFAS detected; lead 3.6 µg/L
  36. 36Racine94/100No PFAS detected; lead 5 µg/L
  37. 37Racine Waterworks94/100No PFAS detected; lead 5 µg/L
  38. 38West Allis Waterworks94/100No PFAS detected; lead 4.9 µg/L
  39. 39Wauwatosa Waterworks94/100No PFAS detected; lead 4.5 µg/L
  40. 40Middleton Waterworks94/100No PFAS detected; lead 5 µg/L
  41. 41Menomonie Waterworks94/100No PFAS detected; lead 4.4 µg/L
  42. 42Waunakee Waterworks94/100No PFAS detected; lead 4.4 µg/L
  43. 43Whitefish Bay Waterworks94/100No PFAS detected; lead 4.7 µg/L
  44. 44Fort Atkinson Waterworks94/100No PFAS detected; lead 4.7 µg/L
  45. 45Greenville Vil94/100No PFAS detected; lead 4.4 µg/L
  46. 46New Richmond Waterworks94/100No PFAS detected; lead 5 µg/L
  47. 47Monroe Waterworks94/100No PFAS detected; lead 4.9 µg/L
  48. 48Deforest Waterworks94/100No PFAS detected; lead 4.5 µg/L
  49. 49Milwaukee Waterworks93/100No PFAS detected; lead 5.2 µg/L
  50. 50Kenosha93/100No PFAS detected; lead 5.3 µg/L
  51. 51Fond Du Lac Waterworks92/100No PFAS detected; lead 6.1 µg/L
  52. 52Wausau Waterworks92/100No PFAS detected; lead 5.8 µg/L
  53. 53North Shore Commission92/100No PFAS detected; lead 5.9 µg/L
  54. 54Hudson Waterworks92/100No PFAS detected; lead 6.2 µg/L
  55. 55Beaver Dam92/100No PFAS detected; lead 6.3 µg/L
  56. 56Whitewater Waterworks92/100No PFAS detected; lead 6.2 µg/L
  57. 57Plover Waterworks92/100No PFAS detected; lead 5.47 µg/L
  58. 58Port Washington Waterworks92/100No PFAS detected; lead 6.3 µg/L
  59. 59Fox Crossing East92/100No PFAS detected; lead 5.6 µg/L
  60. 60Menomonee Falls Ww - Surface91/100No PFAS detected; lead 6.7 µg/L
  61. 61South Milwaukee Waterworks91/100No PFAS detected; lead 6.6 µg/L
  62. 62Shorewood Waterworks91/100No PFAS detected; lead 6.6 µg/L
  63. 63Waukesha90/100Past gross alpha particles and combined radium-226/228 violation on record
  64. 64Oshkosh90/100No PFAS detected; lead 7.5 µg/L
  65. 65Oshkosh Waterworks90/100No PFAS detected; lead 7.5 µg/L
  66. 66Manitowoc Waterworks90/100No PFAS detected; lead 7.7 µg/L
  67. 67Oconomowoc Waterworks90/100No PFAS detected; lead 7 µg/L
  68. 68Stoughton Waterworks90/100PFAS detected below EPA limits; lead 2.8 µg/L
  69. 69Little Chute Waterworks90/100No PFAS detected; lead 7.6 µg/L
  70. 70Germantown89/100No PFAS detected; lead 8.2 µg/L
  71. 71Wis Rapids Lighting Comm89/100No PFAS detected; lead 8.1 µg/L
  72. 72Sussex Village Hall89/100Past combined radium-226/228 and gross alpha particles violation on record
  73. 73Oregon Waterworks89/100No PFAS detected; lead 8.4 µg/L
  74. 74Janesville88/100No PFAS detected; lead 9.49 µg/L
  75. 75Holmen Waterworks88/100No PFAS detected; lead 9.14 µg/L
  76. 76Neenah Waterworks87/100No PFAS detected; lead 9.9 µg/L
  77. 77Burlington Waterworks87/100No PFAS detected; lead 9.8 µg/L
  78. 78Sun Prairie84/100Past fluoride violation on record
  79. 79Beloit84/100Past combined radium-226/228 violation on record
  80. 80Platteville Waterworks84/100No PFAS detected; lead 12.2 µg/L
  81. 81Watertown Waterworks82/100No PFAS detected; lead 14 µg/L
  82. 82Cudahy Waterworks82/100No PFAS detected; lead 13 µg/L
  83. 83Two Rivers Waterworks82/100No PFAS detected; lead 13 µg/L
  84. 84Portage Waterworks82/100PFAS detected below EPA limits; lead 1.7 µg/L
  85. 85Madison81/100PFAS detected below EPA limits; lead 3.36 µg/L
  86. 86Brookfield81/100Past combined radium-226/228 and gross alpha particles violation on record
  87. 87Eau Claire67/100PFHxS 11 ng/L, 1.1× the EPA limit
  88. 88Eau Claire Waterworks67/100PFHxS 11 ng/L, 1.1× the EPA limit
  89. 89La Crosse Waterworks66/100PFOS 5.5 ng/L, 1.4× the EPA limit (+1 more PFAS above)
  90. 90Hartford51/100PFOA 6.8 ng/L, 1.7× the EPA limit (+1 more PFAS above)
  91. 91Hartford Waterworks51/100PFOA 6.8 ng/L, 1.7× the EPA limit (+1 more PFAS above)
  92. 92West Bend Waterworks50/100PFOA 6.5 ng/L, 1.6× the EPA limit
  93. 93Weston49/100PFOS 13 ng/L, 3× the EPA limit (+1 more PFAS above)
  94. 94Elkhorn Waterworks48/100Past combined radium-226/228 and arsenic violation on record
  95. 95Marshfield39/100PFOS 14 ng/L, 4× the EPA limit (+1 more PFAS above)

Ranked by PurityMap's Purity Score, highest first. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Wisconsin tap water

In EPA's 2024 UCMR 5 testing, 8 cities of 95 had a regulated PFAS (PFOA, PFOS or PFHxS) above the new federal limit, and PFAS were detected at any level in 12.

PFOS in Wisconsin PFOA in Wisconsin What PFAS are Filters certified for PFAS

Lead in Wisconsin tap water

Utilities report lead as the 90th-percentile result from sampled home taps. 91 of 95 Wisconsin cities reported a value above zero, and 0 cities were above the 15 µg/L federal action level. Lead usually enters water from a building's own pipes, so a test at your tap is the only way to know what you drink.

Lead across Wisconsin Filters certified for lead

Wisconsin counties

Dane County 2Dodge County 1Kenosha County 2Milwaukee County 1Outagamie County 1Ozaukee County 1Racine County 1Rock County 2Sheboygan County 1Washington County 1Waukesha County 3Wood County 1

Largest water systems in WisconsinOrdered by population served. Each links to the city report built from that system's records.

  1. Milwaukee WaterworksMILWAUKEE WATERWORKS · 626,000 people served93/100
  2. MadisonMADISON WATER UTILITY · 272,000 people served81/100
  3. Green BayGREEN BAY WATERWORKS · 107,369 people served96/100
  4. Green Bay WaterworksGREEN BAY WATERWORKS · 107,369 people served96/100
  5. RacineRACINE WATERWORKS · 105,100 people served94/100
  6. Racine WaterworksRACINE WATERWORKS · 105,100 people served94/100
  7. KenoshaKENOSHA WATER UTILITY · 99,218 people served93/100
  8. AppletonAPPLETON WATERWORKS · 74,511 people served98/100
  9. Appleton WaterworksAPPLETON WATERWORKS · 74,511 people served98/100
  10. WaukeshaWAUKESHA WATER UTILITY · 70,718 people served90/100

What you can do next

Start with your supplier

State patterns cannot identify what reaches a specific address. Resolve your public water system before choosing treatment.

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Match treatment to evidence

A filter is useful only when its certified claim covers the contaminant and level in your local record.

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RECOMMENDED FILTERS

Filters for what’s on record in Wisconsin

Matched to contaminant categories in this published record. Confirm the specific NSF/ANSI listing before you buy; recommendations follow the findings, and as an Amazon Associate PurityMap earns from qualifying purchases.

Faucet-Mount Filter
Activated Carbon

Best for a cheap, no-tools way to reduce lead and chlorine at a single faucet.

Read the analysis →
Under-Sink Reverse-Osmosis System
Reverse Osmosis

Best when PFAS, lead, arsenic, nitrate, or fluoride is detected and you want the broadest reduction at a single tap.

Read the analysis →
Under-Sink Carbon Block Filter
Activated Carbon Block

Best when chlorine taste/odor or disinfection by-products are the concern at the kitchen tap, with lead reduction on certified models.

Read the analysis →
Brita Elite Water Filter Pitcher
Activated Carbon / Ion Exchange

Best for a low-cost, no-install way to reduce lead and improve taste for drinking water.

Read the analysis →

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Frequently asked questions

How does Wisconsin tap water compare across cities?

PurityMap ranks 95 cities in Wisconsin by their Purity Score, computed only from contaminants measured in the published EPA record. New Berlin has the highest published score (100/100). The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Wisconsin cities have PFAS above the federal limit?

8 cities of 95 had at least one regulated PFAS (PFOA, PFOS or PFHxS) measured above the 2024 federal limit in EPA's UCMR 5 testing, including Marshfield (PFOS 14 ng/L), Weston (PFOS 13 ng/L), Hartford (PFOA 6.8 ng/L). PFAS were detected at any level in 12.

Is there lead in Wisconsin tap water?

Utilities report lead as a 90th-percentile result from home taps. 91 of 95 Wisconsin cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Have Wisconsin water systems had drinking-water violations?

6 cities in Wisconsin have a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.

Limits, sources and corrections

A statewide page cannot tell you what reaches a specific address. Water quality varies by supplier, sampling period and household plumbing; open a city report for the evidence behind a local result.

Sources: EPA UCMR 5 (PFAS, 2024), SDWIS Lead and Copper Rule 90th-percentile results and health-based violations, and utility Consumer Confidence Reports where on file. Every city report links its dated source records.

Updated 2026-09-16. How PurityMap analyzes water data · Report an error

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