Community Water System · PWSID WI2680214

Pewaukee City Water and Sewer Utility

Serves 8,671 peopleGroundwaterOwner: Local GovernmentPewaukee, Wisconsin
Nothing open that measures the water, but 4 open testing or paperwork violations.

A missed test is not evidence of bad water. It also is not evidence of good water: for that period nobody checked.

On record since 2001: 87 violations. 24 over the limit · 49 missed or late tests · 14 notices or reports. Most recent began 2025-10-01.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

24Over the limit
0Treatment lapse
49Missed or late test
14Notice or report4 open

More violations on record than 99% of active water systems in Wisconsin. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

2001 · Notice or report: 12005 · Notice or report: 1200520102013 · Over the limit: 12014 · Over the limit: 42015 · Over the limit: 320152017 · Over the limit: 42017 · Notice or report: 32018 · Over the limit: 22018 · Missed or late test: 72018 · Missed or late test: 72018 · Notice or report: 12019 · Over the limit: 12019 · Notice or report: 12020 · Missed or late test: 392020 · Missed or late test: 392020 · Missed or late test: 392020 · Missed or late test: 392020 · Missed or late test: 392020 · Missed or late test: 392020 · Missed or late test: 392020 · Missed or late test: 392020 · Missed or late test: 392020 · Missed or late test: 3920202023 · Over the limit: 12023 · Missed or late test: 32023 · Notice or report: 12024 · Over the limit: 42024 · Notice or report: 32025 · Over the limit: 42025 · Notice or report: 32025
One square ≈ 4 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
28% over the limit · 2456% missed or late test · 4916% notice or report · 14

Across Wisconsin, 54% of violations are missed or late tests and 5% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Gross Alpha, Excl. Radon and UCombined Radium (-226 and...2025-10-01 · Gross Alpha, Excl. Radon and U: measured 20.03 PCI/L vs limit 15.50 PCI/L (1.3×)2025-07-01 · Gross Alpha, Excl. Radon and U: measured 21.65 PCI/L vs limit 15.50 PCI/L (1.4×)2025-04-01 · Gross Alpha, Excl. Radon and U: measured 24.45 PCI/L vs limit 15.50 PCI/L (1.6×)2025-01-01 · Gross Alpha, Excl. Radon and U: measured 26.95 PCI/L vs limit 15.50 PCI/L (1.7×)2024-10-01 · Gross Alpha, Excl. Radon and U: measured 24.80 PCI/L vs limit 15.50 PCI/L (1.6×)2024-07-01 · Gross Alpha, Excl. Radon and U: measured 23.20 PCI/L vs limit 15.50 PCI/L (1.5×)2024-04-01 · Gross Alpha, Excl. Radon and U: measured 21.10 PCI/L vs limit 15.50 PCI/L (1.4×)2024-01-01 · Gross Alpha, Excl. Radon and U: measured 17.45 PCI/L vs limit 15.50 PCI/L (1.1×)2023-10-01 · Gross Alpha, Excl. Radon and U: measured 17.43 PCI/L vs limit 15.50 PCI/L (1.1×)2019-07-01 · Combined Radium (-226 and -228): measured 5.75 PCI/L vs limit 5.50 PCI/L (1.0×)2018-04-01 · Combined Radium (-226 and -228): measured 5.61 PCI/L vs limit 5.50 PCI/L (1.0×)2018-01-01 · Combined Radium (-226 and -228): measured 6.20 PCI/L vs limit 5.50 PCI/L (1.1×)2017-10-01 · Combined Radium (-226 and -228): measured 6.20 PCI/L vs limit 5.50 PCI/L (1.1×)2017-07-01 · Combined Radium (-226 and -228): measured 6.48 PCI/L vs limit 5.50 PCI/L (1.2×)2017-04-01 · Combined Radium (-226 and -228): measured 5.94 PCI/L vs limit 5.50 PCI/L (1.1×)2017-01-01 · Combined Radium (-226 and -228): measured 5.57 PCI/L vs limit 5.50 PCI/L (1.0×)2015-10-01 · Combined Radium (-226 and -228): measured 5.55 PCI/L vs limit 5.50 PCI/L (1.0×)2015-07-01 · Combined Radium (-226 and -228): measured 5.55 PCI/L vs limit 5.50 PCI/L (1.0×)2015-04-01 · Combined Radium (-226 and -228): measured 5.66 PCI/L vs limit 5.50 PCI/L (1.0×)2014-10-01 · Gross Alpha, Excl. Radon and U: measured 16.91 PCI/L vs limit 15.50 PCI/L (1.1×)2014-07-01 · Gross Alpha, Excl. Radon and U: measured 20.30 PCI/L vs limit 15.50 PCI/L (1.3×)2014-04-01 · Gross Alpha, Excl. Radon and U: measured 18.34 PCI/L vs limit 15.50 PCI/L (1.2×)2014-01-01 · Gross Alpha, Excl. Radon and U: measured 17.69 PCI/L vs limit 15.50 PCI/L (1.1×)2013-10-01 · Gross Alpha, Excl. Radon and U: measured 16.26 PCI/L vs limit 15.50 PCI/L (1.0×)
Each dot is one over-the-limit violation: the measured value divided by the limit it broke, on a log scale. Most legal limits for chemicals are running averages set for a lifetime of drinking, so “just over” and “ten times over” are very different news. Hover a dot for the numbers.

Lead & copper at the tap

Utilities sample taps in homes most likely to have lead pipes, and report the 90th-percentile result: 9 in 10 homes sampled came in at or below this number. Above the red line (the action level) the utility must act. The action level is not a safe level; EPA's health goal for lead is zero. EPA's file does not date these results, so they are shown highest first.

Lead, 90th percentile 3 results on file · action level 15 ppb

4 ppb
3.3 ppb
2.6 ppb

Open now (4)

  1. 2025-08-18Public Notice ×2PN Violation for NPDWR ViolationOpen
  2. 2024-11-18Public NoticePN Violation for NPDWR ViolationOpen
  3. 2024-07-16Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2025-10-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 20.03 PCI/L · limit 15.50 PCI/LPeriod ended · no return to compliance on file
  2. 2025-08-18Public Notice ×2PN Violation for NPDWR ViolationOpen
  3. 2025-07-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 21.65 PCI/L · limit 15.50 PCI/LPeriod ended · no return to compliance on file
  4. 2025-04-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 24.45 PCI/L · limit 15.50 PCI/LPeriod ended · no return to compliance on file
  5. 2025-03-03Public NoticePN Violation for NPDWR ViolationBack in compliance
  6. 2025-01-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 26.95 PCI/L · limit 15.50 PCI/LPeriod ended · no return to compliance on file
  7. 2024-11-18Public NoticePN Violation for NPDWR ViolationOpen
  8. 2024-10-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 24.80 PCI/L · limit 15.50 PCI/LPeriod ended · no return to compliance on file
  9. 2024-08-29Public NoticePN Violation for NPDWR ViolationBack in compliance
  10. 2024-07-16Public NoticePN Violation for NPDWR ViolationOpen
  11. 2024-07-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 23.20 PCI/L · limit 15.50 PCI/LPeriod ended · no return to compliance on file
  12. 2024-04-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 21.10 PCI/L · limit 15.50 PCI/LPeriod ended · no return to compliance on file
  13. 2024-01-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 17.45 PCI/L · limit 15.50 PCI/LPeriod ended · no return to compliance on file
  14. 2023-12-11Public NoticePN Violation for NPDWR ViolationBack in compliance
  15. 2023-10-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 17.43 PCI/L · limit 15.50 PCI/LPeriod ended · no return to compliance on file
  16. 2023-10-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  17. 2023-07-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  18. 2023-01-01ChlorineMonitoring and Reporting (DBP)Period ended · no return to compliance on file
  19. 2020-01-01StyreneMonitoring, RegularBack in compliance
  20. 2020-01-01DichloromethaneMonitoring, RegularBack in compliance
  21. 2020-01-01Xylenes, TotalMonitoring, RegularBack in compliance
  22. 2020-01-01cis-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  23. 2020-01-01o-DichlorobenzeneMonitoring, RegularBack in compliance
  24. 2020-01-01p-DichlorobenzeneMonitoring, RegularBack in compliance
  25. 2020-01-01Vinyl chlorideMonitoring, RegularBack in compliance
Show the other 61 entries
  1. 2020-01-011,1-DichloroethyleneMonitoring, RegularBack in compliance
  2. 2020-01-01trans-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  3. 2020-01-011,2-DichloroethaneMonitoring, RegularBack in compliance
  4. 2020-01-011,1,1-TrichloroethaneMonitoring, RegularBack in compliance
  5. 2020-01-01Carbon tetrachlorideMonitoring, RegularBack in compliance
  6. 2020-01-011,2-DichloropropaneMonitoring, RegularBack in compliance
  7. 2020-01-01TrichloroethyleneMonitoring, RegularBack in compliance
  8. 2020-01-011,1,2-TrichloroethaneMonitoring, RegularBack in compliance
  9. 2020-01-01ChlorobenzeneMonitoring, RegularBack in compliance
  10. 2020-01-01BenzeneMonitoring, RegularBack in compliance
  11. 2020-01-01TolueneMonitoring, RegularBack in compliance
  12. 2020-01-01EthylbenzeneMonitoring, RegularBack in compliance
  13. 2020-01-011,2,4-TrichlorobenzeneMonitoring, RegularBack in compliance
  14. 2020-01-01TetrachloroethyleneMonitoring, RegularBack in compliance
  15. 2020-01-01Combined Radium (-226 and -228)Monitoring, RegularBack in compliance
  16. 2020-01-01Gross Alpha, Incl. Radon and UMonitoring, RegularBack in compliance
  17. 2020-01-01Gross Alpha, Excl. Radon and UMonitoring, RegularBack in compliance
  18. 2020-01-01Radium-228Monitoring, RegularBack in compliance
  19. 2020-01-01Antimony, TotalMonitoring, RegularBack in compliance
  20. 2020-01-01Thallium, TotalMonitoring, RegularBack in compliance
  21. 2020-01-01Beryllium, TotalMonitoring, RegularBack in compliance
  22. 2020-01-01SodiumMonitoring, RegularBack in compliance
  23. 2020-01-01SeleniumMonitoring, RegularBack in compliance
  24. 2020-01-01NitriteMonitoring, RegularBack in compliance
  25. 2020-01-01Nitrate-NitriteMonitoring, RegularBack in compliance
  26. 2020-01-01NickelMonitoring, RegularBack in compliance
  27. 2020-01-01MercuryMonitoring, RegularBack in compliance
  28. 2020-01-01FluorideMonitoring, RegularBack in compliance
  29. 2020-01-01ArsenicMonitoring, RegularBack in compliance
  30. 2020-01-01BariumMonitoring, RegularBack in compliance
  31. 2020-01-01CadmiumMonitoring, RegularBack in compliance
  32. 2020-01-01ChromiumMonitoring, RegularBack in compliance
  33. 2019-08-08Public NoticePN Violation for NPDWR ViolationBack in compliance
  34. 2019-07-01Combined Radium (-226 and -228)MCL, Averagemeasured 5.75 PCI/L · limit 5.50 PCI/LPeriod ended · no return to compliance on file
  35. 2018-04-01Radium-228Monitoring, RegularBack in compliance
  36. 2018-04-01Gross Alpha, Excl. Radon and UMonitoring, RegularBack in compliance
  37. 2018-04-01Radium-226Monitoring, RegularBack in compliance
  38. 2018-04-01Combined Radium (-226 and -228)MCL, Averagemeasured 5.61 PCI/L · limit 5.50 PCI/LPeriod ended · no return to compliance on file
  39. 2018-02-26Public NoticePN Violation for NPDWR ViolationBack in compliance
  40. 2018-01-01NitrateMonitoring, RegularBack in compliance
  41. 2018-01-01Radium-228Monitoring, RegularBack in compliance
  42. 2018-01-01Gross Alpha, Excl. Radon and UMonitoring, RegularBack in compliance
  43. 2018-01-01Radium-226Monitoring, RegularBack in compliance
  44. 2018-01-01Combined Radium (-226 and -228)MCL, Averagemeasured 6.20 PCI/L · limit 5.50 PCI/LPeriod ended · no return to compliance on file
  45. 2017-11-29Public NoticePN Violation for NPDWR ViolationBack in compliance
  46. 2017-10-01Combined Radium (-226 and -228)MCL, Averagemeasured 6.20 PCI/L · limit 5.50 PCI/LPeriod ended · no return to compliance on file
  47. 2017-08-24Public NoticePN Violation for NPDWR ViolationBack in compliance
  48. 2017-07-01Combined Radium (-226 and -228)MCL, Averagemeasured 6.48 PCI/L · limit 5.50 PCI/LPeriod ended · no return to compliance on file
  49. 2017-04-01Combined Radium (-226 and -228)MCL, Averagemeasured 5.94 PCI/L · limit 5.50 PCI/LPeriod ended · no return to compliance on file
  50. 2017-01-04Public NoticePN Violation for NPDWR ViolationBack in compliance
  51. 2017-01-01Combined Radium (-226 and -228)MCL, Averagemeasured 5.57 PCI/L · limit 5.50 PCI/LPeriod ended · no return to compliance on file
  52. 2015-10-01Combined Radium (-226 and -228)MCL, Averagemeasured 5.55 PCI/L · limit 5.50 PCI/LBack in compliance
  53. 2015-07-01Combined Radium (-226 and -228)MCL, Averagemeasured 5.55 PCI/L · limit 5.50 PCI/LBack in compliance
  54. 2015-04-01Combined Radium (-226 and -228)MCL, Averagemeasured 5.66 PCI/L · limit 5.50 PCI/LBack in compliance
  55. 2014-10-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 16.91 PCI/L · limit 15.50 PCI/LBack in compliance
  56. 2014-07-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 20.30 PCI/L · limit 15.50 PCI/LBack in compliance
  57. 2014-04-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 18.34 PCI/L · limit 15.50 PCI/LBack in compliance
  58. 2014-01-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 17.69 PCI/L · limit 15.50 PCI/LBack in compliance
  59. 2013-10-01Gross Alpha, Excl. Radon and UMCL, Averagemeasured 16.26 PCI/L · limit 15.50 PCI/LBack in compliance
  60. 2005-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  61. 2001-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance

System details

Population served8,671
Service connections3,211
Water sourceGroundwater
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityPewaukee
EPA ZIP on file53072

Areas served

  • Pewaukee, Waukesha County

Reading this record

Pewaukee City Water and Sewer Utility is a community water system that draws from groundwater and serves about 8,671 people in Pewaukee, Wisconsin. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.