Community Water System · PWSID WI8550278

Sheldon Water Utility

Serves 265 peopleGroundwaterOwner: Local GovernmentSheldon, Wisconsin
Nothing open that measures the water, but 8 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 1993: 51 violations. 5 treatment lapses · 29 missed or late tests · 17 notices or reports. Most recent began 2025-09-01.

None of them is a measurement of contaminated water.

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

0Over the limit
5Treatment lapse
29Missed or late test
17Notice or report8 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

1993 · Missed or late test: 11994 · Treatment lapse: 119951996 · Missed or late test: 11999 · Missed or late test: 12000 · Notice or report: 120002002 · Notice or report: 12004 · Notice or report: 12005 · Notice or report: 32005 · Notice or report: 320052006 · Notice or report: 22009 · Notice or report: 42009 · Notice or report: 4201020152016 · Missed or late test: 12016 · Notice or report: 12017 · Treatment lapse: 12017 · Notice or report: 12020 · Missed or late test: 120202021 · Missed or late test: 42021 · Missed or late test: 42022 · Missed or late test: 12023 · Treatment lapse: 12023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122024 · Treatment lapse: 12024 · Missed or late test: 32024 · Missed or late test: 32024 · Notice or report: 22025 · Treatment lapse: 12025 · Missed or late test: 42025 · Missed or late test: 42025 · Notice or report: 12025
One square ≈ 2 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
10% treatment lapse · 557% missed or late test · 2933% notice or report · 17

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

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

3 ppb
2.9 ppb
1.7 ppb

Open now (8)

  1. 2025-07-02Public NoticePN Violation for NPDWR ViolationOpen
  2. 2009-10-01Public Notice ×2PN Violation for NPDWR ViolationOpen
  3. 2009-04-01Public Notice ×2PN Violation for NPDWR ViolationOpen
  4. 2006-03-01Public NoticePN Violation for NPDWR ViolationOpen
  5. 2006-01-01Public NoticePN Violation for NPDWR ViolationOpen
  6. 2005-12-01Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2025-09-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  2. 2025-07-02Public NoticePN Violation for NPDWR ViolationOpen
  3. 2025-07-02Groundwater RuleFailure To Address DeficiencyBack in compliance
  4. 2025-05-01Revised Total Coliform RuleMONBack in compliance
  5. 2025-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  6. 2025-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  7. 2024-09-21Revised Total Coliform RuleRPTBack in compliance
  8. 2024-09-21Revised Total Coliform RuleTTBack in compliance
  9. 2024-07-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  10. 2024-07-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  11. 2024-06-01Revised Total Coliform RuleMONBack in compliance
  12. 2024-03-21Public NoticePN Violation without NPDWR ViolationBack in compliance
  13. 2023-11-02DBP Stage 1Treatment Technique No Certif. OperatorBack in compliance
  14. 2023-10-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  15. 2023-10-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  16. 2023-07-01Revised Total Coliform RuleMONBack in compliance
  17. 2023-07-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  18. 2023-07-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  19. 2023-04-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  20. 2023-04-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  21. 2023-04-01NitrateMonitoring, RegularBack in compliance
  22. 2023-04-01ManganeseMonitoring, RegularBack in compliance
  23. 2023-02-01Revised Total Coliform RuleMONBack in compliance
  24. 2023-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  25. 2023-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
Show the other 24 entries
  1. 2022-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  2. 2021-07-01ManganeseMonitoring, RegularBack in compliance
  3. 2021-07-01NitrateMonitoring, RegularBack in compliance
  4. 2021-02-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  5. 2021-01-01NitrateMonitoring, RegularBack in compliance
  6. 2020-09-01Revised Total Coliform RuleMONBack in compliance
  7. 2017-02-25Revised Total Coliform RuleRPTBack in compliance
  8. 2017-02-25Revised Total Coliform RuleTTBack in compliance
  9. 2016-10-21Revised Total Coliform RuleRPTBack in compliance
  10. 2016-10-01NitrateMonitoring, RegularBack in compliance
  11. 2009-10-01Public Notice ×2PN Violation for NPDWR ViolationOpen
  12. 2009-04-01Public Notice ×2PN Violation for NPDWR ViolationOpen
  13. 2006-03-01Public NoticePN Violation for NPDWR ViolationOpen
  14. 2006-01-01Public NoticePN Violation for NPDWR ViolationOpen
  15. 2005-12-01Public NoticePN Violation for NPDWR ViolationOpen
  16. 2005-08-04Public NoticePN Violation for NPDWR ViolationBack in compliance
  17. 2005-06-24Public NoticePN Violation for NPDWR ViolationBack in compliance
  18. 2004-12-30Public NoticePN Violation for NPDWR ViolationBack in compliance
  19. 2002-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  20. 2000-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  21. 1999-01-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance
  22. 1996-07-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  23. 1994-07-01Lead and Copper RuleOCCT/SOWT Study/RecommendationBack in compliance
  24. 1993-07-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served265
Service connections98
Water sourceGroundwater
System typeCommunity Water System
OwnerLocal Government
StatusActive
CitySheldon
EPA ZIP on file54766

Areas served

  • Sheldon, Rusk County

Reading this record

Sheldon Water Utility is a community water system that draws from groundwater and serves about 265 people in Sheldon, 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.