Community Water System · PWSID LA1099009

United Water System

Serves 4,446 peopleGroundwaterOwner: PrivateArnaudville, Louisiana
3 open treatment violations.

Open for: Groundwater Rule. EPA counts treatment-technique violations as health-based: a required protective step was not done. It is not a measurement of contamination.

On record since 2004: 27 violations. 13 over the limit · 4 treatment lapses · 4 missed or late tests · 6 notices or reports. Most recent began 2022-10-01.

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

13Over the limit
4Treatment lapse3 open
4Missed or late test
6Notice or report2 open

More violations on record than 83% 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 · Notice or report: 12005 · Missed or late test: 120052006 · Notice or report: 1201020152016 · Missed or late test: 12016 · Notice or report: 22016 · Notice or report: 22017 · Over the limit: 32017 · Over the limit: 32017 · Over the limit: 32017 · Treatment lapse: 12017 · Missed or late test: 12017 · Notice or report: 22017 · Notice or report: 22018 · Over the limit: 32018 · Over the limit: 32018 · Over the limit: 32019 · Over the limit: 42019 · Over the limit: 42019 · Over the limit: 42019 · Over the limit: 42020 · Over the limit: 22020 · Over the limit: 220202021 · Missed or late test: 12022 · Over the limit: 12022 · Treatment lapse: 32022 · Treatment lapse: 32022 · Treatment lapse: 32025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
48% over the limit · 1315% treatment lapse · 415% missed or late test · 422% notice or report · 6

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×+Arsenic2022-10-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2020-04-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2020-01-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2019-10-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2019-07-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2019-04-01 · Arsenic: measured 0.0120 MG/L vs limit 0.0100 MG/L (1.2×)2019-01-01 · Arsenic: measured 0.0130 MG/L vs limit 0.0100 MG/L (1.3×)2018-10-01 · Arsenic: measured 0.0140 MG/L vs limit 0.0100 MG/L (1.4×)2018-07-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2018-01-01 · Arsenic: measured 0.0120 MG/L vs limit 0.0100 MG/L (1.2×)2017-10-01 · Arsenic: measured 0.0120 MG/L vs limit 0.0100 MG/L (1.2×)2017-07-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2017-04-01 · 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 12 results on file · action level 15 ppb

4 ppb
3 ppb
3 ppb
2 ppb
2 ppb
2 ppb
2 ppb
1 ppb
1 ppb
1 ppb
1 ppb
1 ppb

Copper, 90th percentile 5 results on file · action level 1.3 mg/L

2.1 mg/L
2 mg/L
1.9 mg/L
1.6 mg/L
1.6 mg/L

Open now (5)

  1. 2022-05-24Groundwater Rule ×3Failure To Address DeficiencyOpen
  2. 2017-11-04Public Notice ×2PN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2022-10-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  2. 2022-05-24Groundwater Rule ×3Failure To Address DeficiencyOpen
  3. 2021-02-19Lead and Copper RuleLead Consumer NoticeBack in compliance
  4. 2020-04-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  5. 2020-01-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  6. 2019-10-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  7. 2019-07-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  8. 2019-04-01ArsenicMCL, Averagemeasured 0.0120 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  9. 2019-01-01ArsenicMCL, Averagemeasured 0.0130 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  10. 2018-10-01ArsenicMCL, Averagemeasured 0.0140 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  11. 2018-07-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  12. 2018-01-01ArsenicMCL, Averagemeasured 0.0120 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  13. 2017-11-04Public Notice ×2PN Violation for NPDWR ViolationOpen
  14. 2017-10-01ArsenicMCL, Averagemeasured 0.0120 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  15. 2017-07-11Lead and Copper RuleOCCT/SOWT Study/RecommendationBack in compliance
  16. 2017-07-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  17. 2017-04-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  18. 2017-03-17Lead and Copper RuleLead Consumer NoticeBack in compliance
  19. 2016-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  20. 2016-07-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  21. 2016-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  22. 2006-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  23. 2005-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  24. 2004-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance

System details

Population served4,446
Service connections1,482
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityArnaudville
EPA ZIP on file70512

Areas served

  • St. Martin Parish

Reading this record

United Water System is a community water system that draws from groundwater and serves about 4,446 people in Arnaudville, 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.