No health-based violations on EPA record since 2016.
Serves about 4,059 people (1,866 connections) with groundwater from its own wells.
From EPA's record for IA8482096. PurityMap is independent of Rock Valley Water Supply.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from January 2025 to July 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 14 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| 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 | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| 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 | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| 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 | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| 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 | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| 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 | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| 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 | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-01-13 to 2025-07-08 | UCMR5 Analytical Results: ROCK VALLEY WATER SUPPLY (IA8482096) |
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 →Rock Valley Water Supply's phone number on EPA record is 712-470-1936. Its mailing address is ATTN SHANE VAN BEMMEL OPERATOR, PO BOX 100, ROCK VALLEY, IA 51247.
According to EPA's record, Rock Valley Water Supply uses groundwater from its own wells.
No health-based violations on EPA record since 2016. EPA also lists 2 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Rock Valley Water Supply's latest lead and copper round, which ended in December 2025, was 2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Rock Valley Water Supply. Its phone number on EPA record is 712-470-1936. Its mailing address on EPA record is ATTN SHANE VAN BEMMEL OPERATOR, PO BOX 100, ROCK VALLEY, IA 51247. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.