No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting January 2023.
Serves about 415 people (372 connections) with surface water bought from Lone Chimney Water Association.
From EPA's record for OK3005913. PurityMap is independent of Pawnee Co RWD #4.
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29 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jan–Mar 2023 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2022 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2022 | Total trihalomethanes (TTHM) | 0.083 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2022 | Total trihalomethanes (TTHM) | 0.103 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2021 | Total trihalomethanes (TTHM) | 0.118 mg/L | 0.080 mg/L | Resolved |
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Jul–Sep 2021 | Total trihalomethanes (TTHM) | 0.123 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2021 | Total trihalomethanes (TTHM) | 0.145 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2021 | Haloacetic acids (HAA5) | 0.062 mg/L | 0.060 mg/L | Resolved |
| Jan–Mar 2021 | Total trihalomethanes (TTHM) | 0.157 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2021 | Haloacetic acids (HAA5) | 0.068 mg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2020 | Total trihalomethanes (TTHM) | 0.176 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2020 | Haloacetic acids (HAA5) | 0.08 mg/L | 0.060 mg/L | Resolved |
| Jul–Sep 2020 | Total trihalomethanes (TTHM) | 0.17 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2020 | Haloacetic acids (HAA5) | 0.09 mg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2020 | Haloacetic acids (HAA5) | 0.079 mg/L | 0.060 mg/L | Resolved |
| Apr–Jun 2020 | Total trihalomethanes (TTHM) | 0.173 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2020 | Total trihalomethanes (TTHM) | 0.158 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2020 | Haloacetic acids (HAA5) | 0.074 mg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2019 | Total trihalomethanes (TTHM) | 0.13 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2019 | Total trihalomethanes (TTHM) | 0.133 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2019 | Total trihalomethanes (TTHM) | 0.132 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2019 | Haloacetic acids (HAA5) | 0.065 mg/L | 0.060 mg/L | Resolved |
| Jan–Mar 2019 | Total trihalomethanes (TTHM) | 0.125 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2018 | Total trihalomethanes (TTHM) | 0.151 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2018 | Total trihalomethanes (TTHM) | 0.198 mg/L | 0.080 mg/L | Resolved |
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.
Get PurityMap updates about this water system.
Follow this water →Pawnee Co RWD #4's phone number on EPA record is 918-767-2441. Its mailing address is Ronny Mallory, Chairperson, P.O. BOX 9, PAWNEE, OK 74058.
According to EPA's record, Pawnee Co RWD #4 uses surface water bought from Lone Chimney Water Association.
EPA's record shows 29 health-based violations for Pawnee Co RWD #4 in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting January 2023. EPA also lists 14 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Pawnee Co RWD #4's latest lead and copper round, which ended in December 2023, was 0.9 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Pawnee Co RWD #4. Its phone number on EPA record is 918-767-2441. Its mailing address on EPA record is Ronny Mallory, Chairperson, P.O. BOX 9, PAWNEE, OK 74058. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.