Haloacetic acids (HAA5) above the legal limit in the period starting October 2025; 2 open health-based violations on EPA record.
Serves about 258 people (133 connections) with surface water bought from Copan PWA.
From EPA's record for OK3007415. PurityMap is independent of Washington Co RWD #7.
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11 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Oct–Dec 2025 | Haloacetic acids (HAA5) | 0.07 mg/L | 0.060 mg/L | Archived |
| Jul–Sep 2025 | Haloacetic acids (HAA5) | 0.08 mg/L | 0.060 mg/L | Archived |
| Apr–Jun 2025 | Haloacetic acids (HAA5) | 0.072 mg/L | 0.060 mg/L | Archived |
| Jan–Mar 2025 | Haloacetic acids (HAA5) | 0.069 mg/L | 0.060 mg/L | Archived |
| From October 2024 | Lead and copper rule revisions | – | – | Addressed |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2024 | Total trihalomethanes (TTHM) | 0.105 mg/L | 0.080 mg/L | Archived |
| Apr–Jun 2022 | Total trihalomethanes (TTHM) | 0.103 mg/L | 0.080 mg/L | Archived |
| Oct–Dec 2021 | Total trihalomethanes (TTHM) | 0.087 mg/L | 0.080 mg/L | Archived |
| Jul–Sep 2018 | Total trihalomethanes (TTHM) | 0.089 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2018 | Total trihalomethanes (TTHM) | 0.086 mg/L | 0.080 mg/L | Resolved |
| From June 2017 | Lead and Copper Rule | – | TT | Addressed |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
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Follow this water →Washington Co RWD #7's phone number on EPA record is 918-440-9638. Its mailing address is Larry Underhill, Chairman, P.O. BOX 217, DEWEY, OK 74029.
According to EPA's record, Washington Co RWD #7 uses surface water bought from Copan PWA.
EPA's record shows 11 health-based violations for Washington Co RWD #7 in the 10 years to July 9, 2026. Haloacetic acids (HAA5) were above the legal limit in the period starting October 2025. EPA's record also shows 2 open health-based violations. EPA also lists 25 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Washington Co RWD #7's latest lead and copper round, which ended in December 2025, was 4.7 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Washington Co RWD #7. Its phone number on EPA record is 918-440-9638. Its mailing address on EPA record is Larry Underhill, Chairman, P.O. BOX 217, DEWEY, OK 74029. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.