Community Water System · PWSID AK2120436

Coffman Cove

Serves 199 peopleSurface WaterOwner: Local GovernmentCoffman Cove, Alaska
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 1994: 73 violations. 10 over the limit · 8 treatment lapses · 45 missed or late tests · 10 notices or reports. Most recent began 2025-09-08.

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

10Over the limit
8Treatment lapse
45Missed or late test
10Notice or report1 open

More violations on record than 86% of active water systems in Alaska. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

1994 · Missed or late test: 11995 · Missed or late test: 21995 · Missed or late test: 219951996 · Missed or late test: 31996 · Missed or late test: 31996 · Missed or late test: 31997 · Missed or late test: 11998 · Missed or late test: 11999 · Missed or late test: 1200020052006 · Treatment lapse: 12006 · Notice or report: 12007 · Missed or late test: 12008 · Treatment lapse: 12008 · Missed or late test: 12008 · Notice or report: 12009 · Missed or late test: 52009 · Missed or late test: 52009 · Missed or late test: 52009 · Missed or late test: 52009 · Missed or late test: 52009 · Notice or report: 120102011 · Missed or late test: 12012 · Missed or late test: 22012 · Missed or late test: 22015 · Over the limit: 22015 · Over the limit: 22015 · Missed or late test: 62015 · Missed or late test: 62015 · Missed or late test: 62015 · Missed or late test: 62015 · Missed or late test: 62015 · Missed or late test: 620152016 · Over the limit: 22016 · Over the limit: 22016 · Missed or late test: 32016 · Missed or late test: 32016 · Missed or late test: 32017 · Notice or report: 22017 · Notice or report: 22018 · Notice or report: 22018 · Notice or report: 22019 · Over the limit: 22019 · Over the limit: 22019 · Missed or late test: 22019 · Missed or late test: 22020 · Over the limit: 12020 · Missed or late test: 42020 · Missed or late test: 42020 · Missed or late test: 42020 · Missed or late test: 420202021 · Treatment lapse: 42021 · Treatment lapse: 42021 · Treatment lapse: 42021 · Treatment lapse: 42021 · Missed or late test: 42021 · Missed or late test: 42021 · Missed or late test: 42021 · Missed or late test: 42021 · Notice or report: 12022 · Treatment lapse: 22022 · Treatment lapse: 22022 · Missed or late test: 22022 · Missed or late test: 22024 · Over the limit: 12024 · Missed or late test: 52024 · Missed or late test: 52024 · Missed or late test: 52024 · Missed or late test: 52024 · Missed or late test: 52024 · Notice or report: 12025 · Over the limit: 22025 · Over the limit: 22025 · Notice or report: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
14% over the limit · 1011% treatment lapse · 862% missed or late test · 4514% notice or report · 10

Across Alaska, 88% of violations are missed or late tests and 2% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Total Haloacetic Acids (HAA5)Trihalomethanes (TTHM)2025-04-01 · Total Haloacetic Acids (HAA5): measured 0.0780 MG/L vs limit 0.0600 MG/L (1.3×)2025-01-01 · Total Haloacetic Acids (HAA5): measured 0.0770 MG/L vs limit 0.0600 MG/L (1.3×)2024-10-01 · Total Haloacetic Acids (HAA5): measured 0.0730 MG/L vs limit 0.0600 MG/L (1.2×)2020-07-01 · Trihalomethanes (TTHM): measured 0.0910 MG/L vs limit 0.0800 MG/L (1.1×)2019-04-01 · Trihalomethanes (TTHM): measured 0.0850 MG/L vs limit 0.0800 MG/L (1.1×)2019-01-01 · Trihalomethanes (TTHM): measured 0.0820 MG/L vs limit 0.0800 MG/L (1.0×)2016-04-01 · Trihalomethanes (TTHM): measured 0.0900 MG/L vs limit 0.0800 MG/L (1.1×)2016-01-01 · Trihalomethanes (TTHM): measured 0.0970 MG/L vs limit 0.0800 MG/L (1.2×)2015-10-01 · Trihalomethanes (TTHM): measured 0.0920 MG/L vs limit 0.0800 MG/L (1.1×)2015-07-01 · Trihalomethanes (TTHM): measured 0.1060 MG/L vs limit 0.0800 MG/L (1.3×)
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

2.1 ppb
1.2 ppb
0 ppb

Open now (1)

  1. 2025-09-08Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2025-09-08Public NoticePN Violation for NPDWR ViolationOpen
  2. 2025-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0780 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  3. 2025-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0770 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  4. 2024-12-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Period ended · no return to compliance on file
  5. 2024-12-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Period ended · no return to compliance on file
  6. 2024-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0730 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  7. 2024-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  8. 2024-06-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  9. 2024-06-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  10. 2024-06-01Revised Total Coliform RuleMONBack in compliance
  11. 2022-04-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.5100 RATIOBack in compliance
  12. 2022-01-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.3100 RATIOBack in compliance
  13. 2022-01-01Carbon, TotalMonitoring and Reporting (DBP)Back in compliance
  14. 2022-01-01Revised Total Coliform RuleMONBack in compliance
  15. 2021-12-01Revised Total Coliform RuleMONBack in compliance
  16. 2021-10-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.2200 RATIO · limit 1.00 RATIOBack in compliance
  17. 2021-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  18. 2021-08-01Revised Total Coliform RuleMONBack in compliance
  19. 2021-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  20. 2021-07-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.1000 RATIOBack in compliance
  21. 2021-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  22. 2021-04-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.6700 RATIOBack in compliance
  23. 2021-01-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.9100 RATIOBack in compliance
  24. 2020-12-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  25. 2020-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
Show the other 48 entries
  1. 2020-09-29Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  2. 2020-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0910 MG/L · limit 0.0800 MG/LBack in compliance
  3. 2020-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  4. 2019-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0850 MG/L · limit 0.0800 MG/LBack in compliance
  5. 2019-02-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  6. 2019-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0820 MG/L · limit 0.0800 MG/LBack in compliance
  7. 2019-01-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  8. 2018-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  9. 2018-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  10. 2017-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  11. 2017-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  12. 2016-06-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  13. 2016-06-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  14. 2016-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0900 MG/L · limit 0.0800 MG/LBack in compliance
  15. 2016-03-31Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  16. 2016-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0970 MG/L · limit 0.0800 MG/LBack in compliance
  17. 2015-12-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  18. 2015-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0920 MG/L · limit 0.0800 MG/LBack in compliance
  19. 2015-09-29Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  20. 2015-09-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  21. 2015-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  22. 2015-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1060 MG/L · limit 0.0800 MG/LBack in compliance
  23. 2015-06-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  24. 2015-04-01Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  25. 2012-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  26. 2012-01-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  27. 2011-01-01CyanideMonitoring, RegularBack in compliance
  28. 2009-11-20Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  29. 2009-10-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  30. 2009-08-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  31. 2009-08-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  32. 2009-07-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  33. 2009-07-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  34. 2008-07-01Carbon, TotalTreatment Technique Precursor RemovalBack in compliance
  35. 2008-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  36. 2008-07-01Surface water treatment (LT2)Monitoring, Source Water (LT2)Back in compliance
  37. 2007-01-01Carbon, TotalMonitoring and Reporting (DBP)Back in compliance
  38. 2006-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  39. 2006-01-01Carbon, TotalTreatment Technique Precursor RemovalBack in compliance
  40. 1999-06-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  41. 1998-05-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  42. 1997-02-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  43. 1996-07-01Coliform (TCR)Monitoring, Routine Minor (TCR)Back in compliance
  44. 1996-02-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  45. 1996-01-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  46. 1995-09-01Coliform (TCR)Monitoring, Routine Major (TCR)Back in compliance
  47. 1995-07-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance
  48. 1994-07-01Coliform (TCR)Monitoring, Routine Minor (TCR)Back in compliance

System details

Population served199
Service connections156
Water sourceSurface Water
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityCoffman Cove
EPA ZIP on file99918

Areas served

  • Coffman Cove

Reading this record

Coffman Cove is a community water system that draws from surface water and serves about 199 people in Coffman Cove, Alaska. 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.