Non-Transient Non-Community · PWSID AZ0414513

Gowan Milling LLC

Serves 350 peopleGroundwaterOwner: PrivateSomerton, Arizona
1 open treatment violation.

Open for: Lead service line inventory. 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 2014: 24 violations. 1 treatment lapse · 19 missed or late tests · 4 notices or reports. Most recent began 2025-01-01.

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
1Treatment lapse1 open
19Missed or late test
4Notice or report2 open

More violations on record than 70% of active water systems in Arizona. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

200520102014 · Missed or late test: 120152017 · Missed or late test: 32017 · Missed or late test: 32017 · Missed or late test: 32019 · Missed or late test: 22019 · Missed or late test: 22020 · Missed or late test: 42020 · Missed or late test: 42020 · Missed or late test: 42020 · Missed or late test: 42020 · Notice or report: 120202021 · Missed or late test: 22021 · Missed or late test: 22021 · Notice or report: 12022 · Missed or late test: 12023 · Missed or late test: 12024 · Treatment lapse: 12024 · Missed or late test: 32024 · Missed or late test: 32024 · Missed or late test: 32024 · Notice or report: 22024 · Notice or report: 22025 · Missed or late test: 22025 · Missed or late test: 22025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
4% treatment lapse · 179% missed or late test · 1917% notice or report · 4

Across Arizona, 65% 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 5 results on file · action level 15 ppb

3.2 ppb
1.5 ppb
1.3 ppb
1 ppb
0.88 ppb

Copper, 90th percentile 1 result on file · action level 1.3 mg/L

1.4 mg/L

Open now (3)

  1. 2024-12-20Public NoticePN Violation for NPDWR ViolationOpen
  2. 2024-10-17Lead service line inventoryTTOpen
  3. 2024-10-17Lead service line inventoryRPTOpen

Every violation on record

  1. 2025-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  2. 2025-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  3. 2024-12-20Public NoticePN Violation for NPDWR ViolationOpen
  4. 2024-10-17Lead service line inventoryTTOpen
  5. 2024-10-17Lead service line inventoryRPTOpen
  6. 2024-10-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  7. 2024-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  8. 2024-01-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  9. 2023-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  10. 2022-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  11. 2021-03-01Revised Total Coliform RuleRPTBack in compliance
  12. 2021-01-01Conductivity @ 25 C Umhos/CmWater Quality Parameter M/RBack in compliance
  13. 2021-01-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  14. 2020-09-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  15. 2020-09-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  16. 2020-09-01Revised Total Coliform RuleRPTBack in compliance
  17. 2020-07-01Conductivity @ 25 C Umhos/CmWater Quality Parameter M/RBack in compliance
  18. 2020-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  19. 2019-09-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  20. 2019-09-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  21. 2017-11-03Lead and Copper RuleLead Consumer NoticeBack in compliance
  22. 2017-09-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  23. 2017-09-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  24. 2014-01-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served350
Service connections27
Water sourceGroundwater
System typeNon-Transient Non-Community
OwnerPrivate
StatusActive
CitySomerton
EPA ZIP on file85350

Areas served

  • Yuma, Yuma County

Reading this record

Gowan Milling LLC is a non-transient non-community that draws from groundwater and serves about 350 people in Somerton, Arizona. 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.