No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting October 2019.
Serves about 5,823 people (2,423 connections) with surface water bought from Hoxie Water Department and Neapwa.
From EPA's record for AR0000309. PurityMap is independent of Walnut Ridge Waterworks.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Oct–Dec 2019 | Haloacetic acids (HAA5) | 63 µg/L | 0.060 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from March 2025 to September 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-03-26 to 2025-09-29 | UCMR5 Analytical Results: WALNUT RIDGE WATERWORKS (AR0000309) |
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 →Walnut Ridge Waterworks's phone number on EPA record is 870-886-2312. Its mailing address is 216 S W 4TH ST, WALNUT RIDGE, AR 72476.
According to EPA's record, Walnut Ridge Waterworks uses surface water bought from Hoxie Water Department and Neapwa.
EPA's record shows 1 health-based violation for Walnut Ridge Waterworks 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 October 2019. EPA also lists 4 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Walnut Ridge Waterworks's latest lead and copper round, which ended in December 2025, was 1 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Walnut Ridge Waterworks. Its phone number on EPA record is 870-886-2312. Its mailing address on EPA record is 216 S W 4TH ST, WALNUT RIDGE, AR 72476. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.