Community Water System · PWSID AK2340167

Koyuk Public Water System

Serves 277 peopleGroundwater Under InfluenceOwner: Native AmericanKoyuk, 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 2003: 123 violations. 10 treatment lapses · 101 missed or late tests · 12 notices or reports. Most recent began 2025-07-01.

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
10Treatment lapse
101Missed or late test
12Notice or report1 open

More violations on record than 90% 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

2003 · Notice or report: 12004 · Notice or report: 120052006 · Missed or late test: 12006 · Notice or report: 12008 · Missed or late test: 12008 · Notice or report: 120102012 · Notice or report: 12014 · Missed or late test: 52014 · Missed or late test: 52014 · Notice or report: 12015 · Missed or late test: 220152016 · Treatment lapse: 32016 · Missed or late test: 32016 · Notice or report: 12017 · Missed or late test: 52017 · Missed or late test: 52018 · Missed or late test: 72018 · Missed or late test: 72018 · Missed or late test: 72018 · Notice or report: 12019 · Treatment lapse: 12019 · Missed or late test: 112019 · Missed or late test: 112019 · Missed or late test: 112019 · Missed or late test: 112019 · Notice or report: 22020 · Treatment lapse: 12020 · Missed or late test: 52020 · Missed or late test: 520202021 · Treatment lapse: 12021 · Missed or late test: 92021 · Missed or late test: 92021 · Missed or late test: 92022 · Treatment lapse: 22022 · Missed or late test: 312022 · Missed or late test: 312022 · Missed or late test: 312022 · Missed or late test: 312022 · Missed or late test: 312022 · Missed or late test: 312022 · Missed or late test: 312022 · Missed or late test: 312022 · Missed or late test: 312022 · Missed or late test: 312022 · Missed or late test: 312023 · Missed or late test: 92023 · Missed or late test: 92023 · Missed or late test: 92023 · Notice or report: 12024 · Treatment lapse: 22024 · Missed or late test: 62024 · Missed or late test: 62024 · Notice or report: 12025 · Missed or late test: 62025 · Missed or late test: 62025
One square ≈ 3 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
8% treatment lapse · 1082% missed or late test · 10110% notice or report · 12

Across Alaska, 88% of violations are missed or late tests and 2% 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 6 results on file · action level 15 ppb

6.2 ppb
2.9 ppb
2 ppb
2 ppb
2 ppb
0.7 ppb

Open now (1)

  1. 2012-06-06Unknown contaminantSanitary Survey (TCR)Open

Every violation on record

  1. 2025-07-01Revised Total Coliform RuleMONBack in compliance
  2. 2025-07-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  3. 2025-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  4. 2025-05-01Revised Total Coliform RuleMONBack in compliance
  5. 2025-05-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  6. 2025-05-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  7. 2024-11-01Revised Total Coliform RuleMONBack in compliance
  8. 2024-11-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  9. 2024-11-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  10. 2024-10-17Lead service line inventoryRPTBack in compliance
  11. 2024-10-17Lead service line inventoryTTBack in compliance
  12. 2024-10-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  13. 2024-10-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  14. 2024-04-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  15. 2024-04-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  16. 2023-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  17. 2023-07-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  18. 2023-07-01Revised Total Coliform RuleMONBack in compliance
  19. 2023-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  20. 2023-04-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  21. 2023-04-01Revised Total Coliform RuleMONBack in compliance
  22. 2023-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  23. 2023-03-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  24. 2023-03-01Revised Total Coliform RuleMONBack in compliance
  25. 2023-01-01ChlorineMonitoring and Reporting (DBP)Back in compliance
Show the other 98 entries
  1. 2022-11-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  2. 2022-11-01Revised Total Coliform RuleMONBack in compliance
  3. 2022-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  4. 2022-10-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  5. 2022-07-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  6. 2022-04-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  7. 2022-03-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  8. 2022-03-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  9. 2022-02-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  10. 2022-02-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  11. 2022-01-01StyreneMonitoring, RegularBack in compliance
  12. 2022-01-01EthylbenzeneMonitoring, RegularBack in compliance
  13. 2022-01-01TolueneMonitoring, RegularBack in compliance
  14. 2022-01-01BenzeneMonitoring, RegularBack in compliance
  15. 2022-01-01ChlorobenzeneMonitoring, RegularBack in compliance
  16. 2022-01-01TetrachloroethyleneMonitoring, RegularBack in compliance
  17. 2022-01-011,1,2-TrichloroethaneMonitoring, RegularBack in compliance
  18. 2022-01-01TrichloroethyleneMonitoring, RegularBack in compliance
  19. 2022-01-011,2-DichloropropaneMonitoring, RegularBack in compliance
  20. 2022-01-01Carbon tetrachlorideMonitoring, RegularBack in compliance
  21. 2022-01-011,1,1-TrichloroethaneMonitoring, RegularBack in compliance
  22. 2022-01-011,2-DichloroethaneMonitoring, RegularBack in compliance
  23. 2022-01-01trans-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  24. 2022-01-011,1-DichloroethyleneMonitoring, RegularBack in compliance
  25. 2022-01-01Vinyl chlorideMonitoring, RegularBack in compliance
  26. 2022-01-01p-DichlorobenzeneMonitoring, RegularBack in compliance
  27. 2022-01-01o-DichlorobenzeneMonitoring, RegularBack in compliance
  28. 2022-01-01DichloromethaneMonitoring, RegularBack in compliance
  29. 2022-01-01Xylenes, TotalMonitoring, RegularBack in compliance
  30. 2022-01-01cis-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  31. 2022-01-011,2,4-TrichlorobenzeneMonitoring, RegularBack in compliance
  32. 2022-01-01NitrateMonitoring, RegularBack in compliance
  33. 2022-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  34. 2021-12-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  35. 2021-12-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  36. 2021-11-01Revised Total Coliform RuleMONBack in compliance
  37. 2021-10-01Revised Total Coliform RuleMONBack in compliance
  38. 2021-09-01Revised Total Coliform RuleMONBack in compliance
  39. 2021-07-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  40. 2021-07-01Revised Total Coliform RuleMONBack in compliance
  41. 2021-07-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  42. 2021-03-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  43. 2021-03-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  44. 2020-08-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  45. 2020-06-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  46. 2020-06-01Revised Total Coliform RuleMONBack in compliance
  47. 2020-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  48. 2020-04-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  49. 2020-04-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  50. 2019-12-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  51. 2019-12-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  52. 2019-12-01Revised Total Coliform RuleMONBack in compliance
  53. 2019-11-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  54. 2019-11-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  55. 2019-11-01Revised Total Coliform RuleMONBack in compliance
  56. 2019-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  57. 2019-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  58. 2019-10-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  59. 2019-10-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  60. 2019-08-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  61. 2019-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  62. 2019-02-01Revised Total Coliform RuleMONBack in compliance
  63. 2019-01-01Revised Total Coliform RuleMONBack in compliance
  64. 2018-12-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  65. 2018-12-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  66. 2018-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  67. 2018-07-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  68. 2018-07-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  69. 2018-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  70. 2018-01-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  71. 2018-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  72. 2017-12-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  73. 2017-12-01Revised Total Coliform RuleMONBack in compliance
  74. 2017-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  75. 2017-03-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  76. 2017-03-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  77. 2016-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  78. 2016-09-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  79. 2016-08-01Revised Total Coliform RuleMONBack in compliance
  80. 2016-01-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  81. 2016-01-01Surface water filtration (IESWTR)Monthly Turbidity Exceed (Enhanced SWTR)Back in compliance
  82. 2016-01-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  83. 2016-01-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  84. 2015-12-01Surface water treatment (SWTR)Monitoring of Treatment (SWTR-Filter)Back in compliance
  85. 2015-12-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Back in compliance
  86. 2014-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  87. 2014-03-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  88. 2014-03-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  89. 2014-01-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  90. 2014-01-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  91. 2014-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  92. 2012-06-06Unknown contaminantSanitary Survey (TCR)Open
  93. 2008-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  94. 2008-07-01Surface water treatment (LT2)Monitoring, Source Water (LT2)Back in compliance
  95. 2006-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  96. 2006-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  97. 2004-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  98. 2003-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance

System details

Population served277
Service connections82
Water sourceGroundwater Under Influence
System typeCommunity Water System
OwnerNative American
StatusActive
CityKoyuk
EPA ZIP on file99753

Areas served

  • Koyuk, Nome Census Area

Reading this record

Koyuk Public Water System is a community water system that draws from groundwater under influence and serves about 277 people in Koyuk, 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.