Community Water System · PWSID OK1020535

Mcintosh Co. Rws & Swmd #2 (Onapa)

Serves 2,774 peopleSurface WaterOwner: Local GovernmentChecotah, Oklahoma
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 2015: 61 violations. 37 over the limit · 12 treatment lapses · 11 missed or late tests · 1 notice or report. Most recent began 2025-04-01.

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

37Over the limit
12Treatment lapse1 open
11Missed or late test
1Notice or report1 open

More violations on record than 73% of active water systems in Oklahoma. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

200520102015 · Missed or late test: 22015 · Missed or late test: 220152016 · Over the limit: 32016 · Over the limit: 32016 · Over the limit: 32016 · Missed or late test: 12017 · Over the limit: 42017 · Over the limit: 42017 · Over the limit: 42017 · Over the limit: 42017 · Treatment lapse: 22017 · Treatment lapse: 22018 · Over the limit: 42018 · Over the limit: 42018 · Over the limit: 42018 · Over the limit: 42018 · Missed or late test: 12019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72019 · Missed or late test: 12020 · Over the limit: 72020 · Over the limit: 72020 · Over the limit: 72020 · Over the limit: 72020 · Over the limit: 72020 · Over the limit: 72020 · Over the limit: 72020 · Missed or late test: 42020 · Missed or late test: 42020 · Missed or late test: 42020 · Missed or late test: 420202021 · Over the limit: 22021 · Over the limit: 22022 · Over the limit: 62022 · Over the limit: 62022 · Over the limit: 62022 · Over the limit: 62022 · Over the limit: 62022 · Over the limit: 62022 · Missed or late test: 12023 · Treatment lapse: 42023 · Treatment lapse: 42023 · Treatment lapse: 42023 · Treatment lapse: 42024 · Over the limit: 22024 · Over the limit: 22024 · Treatment lapse: 52024 · Treatment lapse: 52024 · Treatment lapse: 52024 · Treatment lapse: 52024 · Treatment lapse: 52024 · Notice or report: 12025 · Over the limit: 22025 · Over the limit: 22025 · Treatment lapse: 12025 · Missed or late test: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
61% over the limit · 3720% treatment lapse · 1218% missed or late test · 112% notice or report · 1

Across Oklahoma, 73% of violations are missed or late tests and 19% are water over a limit.

How far over the limit

at the limit2×5×10×100×+Trihalomethanes (TTHM)Total Haloacetic Acids (HAA5)2025-04-01 · Trihalomethanes (TTHM): measured 0.0990 MG/L vs limit 0.0800 MG/L (1.2×)2025-01-01 · Trihalomethanes (TTHM): measured 0.1020 MG/L vs limit 0.0800 MG/L (1.3×)2024-10-01 · Trihalomethanes (TTHM): measured 0.0910 MG/L vs limit 0.0800 MG/L (1.1×)2024-07-01 · Trihalomethanes (TTHM): measured 0.0920 MG/L vs limit 0.0800 MG/L (1.1×)2022-07-01 · Trihalomethanes (TTHM): measured 0.0820 MG/L vs limit 0.0800 MG/L (1.0×)2022-07-01 · Total Haloacetic Acids (HAA5): measured 0.0630 MG/L vs limit 0.0600 MG/L (1.1×)2022-04-01 · Total Haloacetic Acids (HAA5): measured 0.0620 MG/L vs limit 0.0600 MG/L (1.0×)2022-04-01 · Trihalomethanes (TTHM): measured 0.0820 MG/L vs limit 0.0800 MG/L (1.0×)2022-01-01 · Trihalomethanes (TTHM): measured 0.0900 MG/L vs limit 0.0800 MG/L (1.1×)2022-01-01 · Total Haloacetic Acids (HAA5): measured 0.0610 MG/L vs limit 0.0600 MG/L (1.0×)2021-10-01 · Trihalomethanes (TTHM): measured 0.0910 MG/L vs limit 0.0800 MG/L (1.1×)2021-04-01 · Trihalomethanes (TTHM): measured 0.0840 MG/L vs limit 0.0800 MG/L (1.1×)2020-10-01 · Trihalomethanes (TTHM): measured 0.0870 MG/L vs limit 0.0800 MG/L (1.1×)2020-07-01 · Trihalomethanes (TTHM): measured 0.0910 MG/L vs limit 0.0800 MG/L (1.1×)2020-07-01 · Trihalomethanes (TTHM): measured 0.0830 MG/L vs limit 0.0800 MG/L (1.0×)2020-04-01 · Trihalomethanes (TTHM): measured 0.0850 MG/L vs limit 0.0800 MG/L (1.1×)2020-04-01 · Trihalomethanes (TTHM): measured 0.0960 MG/L vs limit 0.0800 MG/L (1.2×)2020-01-01 · Trihalomethanes (TTHM): measured 0.0900 MG/L vs limit 0.0800 MG/L (1.1×)2020-01-01 · Trihalomethanes (TTHM): measured 0.1090 MG/L vs limit 0.0800 MG/L (1.4×)2019-10-01 · Trihalomethanes (TTHM): measured 0.0860 MG/L vs limit 0.0800 MG/L (1.1×)2019-10-01 · Trihalomethanes (TTHM): measured 0.1000 MG/L vs limit 0.0800 MG/L (1.2×)2019-07-01 · Trihalomethanes (TTHM): measured 0.0890 MG/L vs limit 0.0800 MG/L (1.1×)2019-07-01 · Trihalomethanes (TTHM): measured 0.1070 MG/L vs limit 0.0800 MG/L (1.3×)2019-04-01 · Trihalomethanes (TTHM): measured 0.1030 MG/L vs limit 0.0800 MG/L (1.3×)2019-04-01 · Trihalomethanes (TTHM): measured 0.0850 MG/L vs limit 0.0800 MG/L (1.1×)2019-01-01 · Trihalomethanes (TTHM): measured 0.0880 MG/L vs limit 0.0800 MG/L (1.1×)2018-10-01 · Trihalomethanes (TTHM): measured 0.0910 MG/L vs limit 0.0800 MG/L (1.1×)2018-07-01 · Trihalomethanes (TTHM): measured 0.0890 MG/L vs limit 0.0800 MG/L (1.1×)2018-04-01 · Trihalomethanes (TTHM): measured 0.0910 MG/L vs limit 0.0800 MG/L (1.1×)2018-01-01 · Trihalomethanes (TTHM): measured 0.0810 MG/L vs limit 0.0800 MG/L (1.0×)2017-10-01 · Trihalomethanes (TTHM): measured 0.0930 MG/L vs limit 0.0800 MG/L (1.2×)2017-07-01 · Trihalomethanes (TTHM): measured 0.0940 MG/L vs limit 0.0800 MG/L (1.2×)2017-04-01 · Trihalomethanes (TTHM): measured 0.0950 MG/L vs limit 0.0800 MG/L (1.2×)2017-01-01 · Trihalomethanes (TTHM): measured 0.0930 MG/L vs limit 0.0800 MG/L (1.2×)2016-10-01 · Trihalomethanes (TTHM): measured 0.0910 MG/L vs limit 0.0800 MG/L (1.1×)2016-07-01 · Trihalomethanes (TTHM): measured 0.0870 MG/L vs limit 0.0800 MG/L (1.1×)2016-04-01 · Trihalomethanes (TTHM): measured 0.0810 MG/L vs limit 0.0800 MG/L (1.0×)
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

0.52 ppb
0 ppb
0 ppb

Open now (2)

  1. 2024-10-17Lead service line inventoryRPTOpen
  2. 2024-10-17Lead service line inventoryTTOpen

Every violation on record

  1. 2025-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0990 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  2. 2025-03-01Surface water filtration (IESWTR)Monitoring, Turbidity (Enhanced SWTR)Period ended · no return to compliance on file
  3. 2025-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1020 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  4. 2025-01-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.9400 RATIOPeriod ended · no return to compliance on file
  5. 2024-10-17Lead service line inventoryRPTOpen
  6. 2024-10-17Lead service line inventoryTTOpen
  7. 2024-10-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.8500 RATIOPeriod ended · no return to compliance on file
  8. 2024-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0910 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  9. 2024-07-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.8000 RATIOPeriod ended · no return to compliance on file
  10. 2024-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0920 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  11. 2024-04-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.8100 RATIOPeriod ended · no return to compliance on file
  12. 2024-01-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.8100 RATIO · limit 1.00 RATIOPeriod ended · no return to compliance on file
  13. 2023-10-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.7700 RATIOPeriod ended · no return to compliance on file
  14. 2023-07-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.7900 RATIOPeriod ended · no return to compliance on file
  15. 2023-04-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.8400 RATIOPeriod ended · no return to compliance on file
  16. 2023-01-01Carbon, TotalTreatment Technique Precursor Removalmeasured 0.9500 RATIO · limit 1.00 RATIOPeriod ended · no return to compliance on file
  17. 2022-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0820 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  18. 2022-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0630 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  19. 2022-06-30Total Haloacetic Acids (HAA5)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  20. 2022-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0620 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  21. 2022-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0820 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  22. 2022-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0900 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  23. 2022-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0610 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  24. 2021-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0910 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  25. 2021-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0840 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
Show the other 30 entries
  1. 2020-12-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  2. 2020-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0870 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  3. 2020-09-29Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  4. 2020-07-01Trihalomethanes (TTHM) ×2MCL, Averagemeasured 0.0910 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  5. 2020-06-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  6. 2020-04-01Trihalomethanes (TTHM) ×2MCL, Averagemeasured 0.0850 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  7. 2020-03-31Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  8. 2020-01-01Trihalomethanes (TTHM) ×2MCL, Averagemeasured 0.0900 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  9. 2019-12-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  10. 2019-10-01Trihalomethanes (TTHM) ×2MCL, Averagemeasured 0.0860 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  11. 2019-07-01Trihalomethanes (TTHM) ×2MCL, Averagemeasured 0.0890 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  12. 2019-04-01Trihalomethanes (TTHM) ×2MCL, Averagemeasured 0.1030 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  13. 2019-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0880 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  14. 2018-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0910 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  15. 2018-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0890 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  16. 2018-06-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  17. 2018-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0910 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  18. 2018-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0810 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  19. 2017-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0930 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  20. 2017-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0940 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  21. 2017-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0950 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  22. 2017-04-01Carbon, TotalTreatment Technique Precursor RemovalPeriod ended · no return to compliance on file
  23. 2017-01-01Carbon, TotalTreatment Technique Precursor RemovalPeriod ended · no return to compliance on file
  24. 2017-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0930 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  25. 2016-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0910 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  26. 2016-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0870 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  27. 2016-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0810 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  28. 2016-03-31Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  29. 2015-06-30Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance
  30. 2015-04-01Trihalomethanes (TTHM)Failure Submit IDSE/Subpart V Plan RptBack in compliance

System details

Population served2,774
Service connections1,009
Water sourceSurface Water
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityChecotah
EPA ZIP on file74426-8515

Areas served

  • Mcintosh County

Reading this record

Mcintosh Co. Rws & Swmd #2 (Onapa) is a community water system that draws from surface water and serves about 2,774 people in Checotah, Oklahoma. 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.