Community Water System · PWSID LA1111017

West Sterlington Water System

Serves 1,095 peopleGroundwaterOwner: PrivateSterlington, Louisiana
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On record since 2004: 34 violations. 28 over the limit · 1 treatment lapse · 1 missed or late test · 4 notices or reports. Most recent began 2025-07-01.

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

28Over the limit
1Treatment lapse
1Missed or late test
4Notice or report

More violations on record than 87% of active water systems in Louisiana. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

2004 · Missed or late test: 120052006 · Notice or report: 120102011 · Notice or report: 120152018 · Over the limit: 12019 · Over the limit: 42019 · Over the limit: 42019 · Over the limit: 42019 · Over the limit: 42019 · Notice or report: 12020 · Over the limit: 42020 · Over the limit: 42020 · Over the limit: 42020 · Over the limit: 420202021 · Over the limit: 42021 · Over the limit: 42021 · Over the limit: 42021 · Over the limit: 42021 · Treatment lapse: 12022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42023 · Over the limit: 42023 · Over the limit: 42023 · Over the limit: 42023 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Notice or report: 12025 · Over the limit: 32025 · Over the limit: 32025 · Over the limit: 32025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
82% over the limit · 283% treatment lapse · 13% missed or late test · 112% notice or report · 4

Across Louisiana, 31% of violations are missed or late tests and 25% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Trihalomethanes (TTHM)2025-07-01 · Trihalomethanes (TTHM): measured 0.2670 MG/L vs limit 0.0800 MG/L (3.3×)2025-04-01 · Trihalomethanes (TTHM): measured 0.2640 MG/L vs limit 0.0800 MG/L (3.3×)2025-01-01 · Trihalomethanes (TTHM): measured 0.2720 MG/L vs limit 0.0800 MG/L (3.4×)2024-10-01 · Trihalomethanes (TTHM): measured 0.2700 MG/L vs limit 0.0800 MG/L (3.4×)2024-07-01 · Trihalomethanes (TTHM): measured 0.2790 MG/L vs limit 0.0800 MG/L (3.5×)2024-04-01 · Trihalomethanes (TTHM): measured 0.2870 MG/L vs limit 0.0800 MG/L (3.6×)2024-01-01 · Trihalomethanes (TTHM): measured 0.2580 MG/L vs limit 0.0800 MG/L (3.2×)2023-10-01 · Trihalomethanes (TTHM): measured 0.2560 MG/L vs limit 0.0800 MG/L (3.2×)2023-07-01 · Trihalomethanes (TTHM): measured 0.2460 MG/L vs limit 0.0800 MG/L (3.1×)2023-04-01 · Trihalomethanes (TTHM): measured 0.2160 MG/L vs limit 0.0800 MG/L (2.7×)2023-01-01 · Trihalomethanes (TTHM): measured 0.2260 MG/L vs limit 0.0800 MG/L (2.8×)2022-10-01 · Trihalomethanes (TTHM): measured 0.2220 MG/L vs limit 0.0800 MG/L (2.8×)2022-07-01 · Trihalomethanes (TTHM): measured 0.2170 MG/L vs limit 0.0800 MG/L (2.7×)2022-04-01 · Trihalomethanes (TTHM): measured 0.2270 MG/L vs limit 0.0800 MG/L (2.8×)2022-01-01 · Trihalomethanes (TTHM): measured 0.2520 MG/L vs limit 0.0800 MG/L (3.1×)2021-10-01 · Trihalomethanes (TTHM): measured 0.2550 MG/L vs limit 0.0800 MG/L (3.2×)2021-07-01 · Trihalomethanes (TTHM): measured 0.2600 MG/L vs limit 0.0800 MG/L (3.2×)2021-04-01 · Trihalomethanes (TTHM): measured 0.2550 MG/L vs limit 0.0800 MG/L (3.2×)2021-01-01 · Trihalomethanes (TTHM): measured 0.2390 MG/L vs limit 0.0800 MG/L (3.0×)2020-10-01 · Trihalomethanes (TTHM): measured 0.2390 MG/L vs limit 0.0800 MG/L (3.0×)2020-07-01 · Trihalomethanes (TTHM): measured 0.2390 MG/L vs limit 0.0800 MG/L (3.0×)2020-04-01 · Trihalomethanes (TTHM): measured 0.2400 MG/L vs limit 0.0800 MG/L (3.0×)2020-01-01 · Trihalomethanes (TTHM): measured 0.2220 MG/L vs limit 0.0800 MG/L (2.8×)2019-10-01 · Trihalomethanes (TTHM): measured 0.2010 MG/L vs limit 0.0800 MG/L (2.5×)2019-07-01 · Trihalomethanes (TTHM): measured 0.1920 MG/L vs limit 0.0800 MG/L (2.4×)2019-04-01 · Trihalomethanes (TTHM): measured 0.1710 MG/L vs limit 0.0800 MG/L (2.1×)2019-01-01 · Trihalomethanes (TTHM): measured 155.00 UG/L vs limit 80.00 UG/L (1.9×)2018-10-01 · Trihalomethanes (TTHM): measured 172.00 UG/L vs limit 80.00 UG/L (2.1×)
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 4 results on file · action level 15 ppb

1 ppb
1 ppb
1 ppb
1 ppb

Every violation on record

  1. 2025-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2670 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  2. 2025-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2640 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  3. 2025-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2720 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  4. 2024-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2700 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  5. 2024-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2790 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  6. 2024-06-15Public NoticePN Violation for NPDWR ViolationBack in compliance
  7. 2024-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2870 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  8. 2024-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2580 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  9. 2023-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2560 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  10. 2023-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2460 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  11. 2023-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2160 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  12. 2023-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2260 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  13. 2022-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2220 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  14. 2022-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2170 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  15. 2022-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2270 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  16. 2022-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2520 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  17. 2021-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2550 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  18. 2021-10-01Groundwater RuleFailure To Address DeficiencyBack in compliance
  19. 2021-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2600 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  20. 2021-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2550 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  21. 2021-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2390 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  22. 2020-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2390 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  23. 2020-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2390 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  24. 2020-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2400 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  25. 2020-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2220 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
Show the other 9 entries
  1. 2019-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.2010 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  2. 2019-09-10Public NoticePN Violation for NPDWR ViolationBack in compliance
  3. 2019-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1920 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  4. 2019-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1710 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  5. 2019-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 155.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  6. 2018-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 172.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  7. 2011-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  8. 2006-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  9. 2004-01-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served1,095
Service connections365
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CitySterlington
EPA ZIP on file71280

Areas served

  • Union Parish

Reading this record

West Sterlington Water System is a community water system that draws from groundwater and serves about 1,095 people in Sterlington, Louisiana. 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.