Community Water System · PWSID LA1099004

St Martin Water District 4 - Catahoula

Serves 3,000 peopleGroundwater PurchasedOwner: Local GovernmentSt. Martinville, Louisiana
Nothing open that measures the water, but 1 open testing or paperwork violation.

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 2010: 29 violations. 7 over the limit · 2 treatment lapses · 9 missed or late tests · 11 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.

7Over the limit
2Treatment lapse
9Missed or late test1 open
11Notice or report

More violations on record than 84% 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

20052010 · Missed or late test: 22010 · Missed or late test: 220102011 · Treatment lapse: 12011 · Missed or late test: 22011 · Missed or late test: 22011 · Notice or report: 52011 · Notice or report: 52011 · Notice or report: 52011 · Notice or report: 52011 · Notice or report: 52012 · Missed or late test: 22012 · Missed or late test: 22012 · Notice or report: 22012 · Notice or report: 22013 · Missed or late test: 22013 · Missed or late test: 22013 · Notice or report: 12014 · Notice or report: 12015 · Notice or report: 120152017 · Notice or report: 12018 · Treatment lapse: 12020 · Over the limit: 120202021 · Missed or late test: 12022 · Over the limit: 12024 · Over the limit: 22024 · Over the limit: 22025 · 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.
24% over the limit · 77% treatment lapse · 231% missed or late test · 938% notice or report · 11

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×+Arsenic2025-07-01 · Arsenic: measured 0.0120 MG/L vs limit 0.0100 MG/L (1.2×)2025-04-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2025-01-01 · Arsenic: measured 0.0130 MG/L vs limit 0.0100 MG/L (1.3×)2024-10-01 · Arsenic: measured 0.0120 MG/L vs limit 0.0100 MG/L (1.2×)2024-04-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2022-07-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)
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 3 results on file · action level 15 ppb

6 ppb
1 ppb
1 ppb

Open now (1)

  1. 2021-01-17Lead and Copper RuleLead Consumer NoticeOpen

Every violation on record

  1. 2025-07-01ArsenicMCL, Averagemeasured 0.0120 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  2. 2025-04-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  3. 2025-01-01ArsenicMCL, Averagemeasured 0.0130 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  4. 2024-10-01ArsenicMCL, Averagemeasured 0.0120 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  5. 2024-04-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  6. 2022-07-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LBack in compliance
  7. 2021-01-17Lead and Copper RuleLead Consumer NoticeOpen
  8. 2020-06-01Revised Total Coliform RuleMCLBack in compliance
  9. 2018-09-19Revised Total Coliform RuleTTBack in compliance
  10. 2017-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  11. 2015-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  12. 2014-03-19Public NoticePN Violation for NPDWR ViolationBack in compliance
  13. 2013-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  14. 2013-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  15. 2013-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  16. 2012-10-15Public NoticePN Violation for NPDWR ViolationBack in compliance
  17. 2012-07-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  18. 2012-07-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  19. 2012-05-31Public NoticePN Violation for NPDWR ViolationBack in compliance
  20. 2011-10-14Public NoticePN Violation for NPDWR ViolationBack in compliance
  21. 2011-09-25Public NoticePN Violation for NPDWR ViolationBack in compliance
  22. 2011-08-15Public NoticePN Violation for NPDWR ViolationBack in compliance
  23. 2011-07-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  24. 2011-07-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  25. 2011-05-14Public NoticePN Violation for NPDWR ViolationBack in compliance
Show the other 4 entries
  1. 2011-04-09Public NoticePN Violation for NPDWR ViolationBack in compliance
  2. 2011-03-07Groundwater RuleFailure To Address DeficiencyBack in compliance
  3. 2010-07-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  4. 2010-07-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance

System details

Population served3,000
Service connections1,000
Water sourceGroundwater Purchased
System typeCommunity Water System
OwnerLocal Government
StatusActive
CitySt. Martinville
EPA ZIP on file70582

Areas served

  • St. Martin Parish

Reading this record

St Martin Water District 4 - Catahoula is a community water system that draws from groundwater purchased and serves about 3,000 people in St. Martinville, 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.