No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting April 2024.
Serves about 8,891 people (3,660 connections) with surface water bought from City of Cambridge.
From EPA's record for OH3000603. PurityMap is independent of Guernsey Co. Water Dept..
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4 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Apr–Jun 2024 | Haloacetic acids (HAA5) | 0.063 mg/L | 0.060 mg/L | Resolved |
| Oct–Dec 2017 | Total trihalomethanes (TTHM) | 0.081 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2017 | Total trihalomethanes (TTHM) | 0.099 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2017 | Total trihalomethanes (TTHM) | 0.084 mg/L | 0.080 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2025 to August 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 9.8 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Lithium | 9.7 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| 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 | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| 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 | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| 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 | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| 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 | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| 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 | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| 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 | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-02-19 to 2025-08-19 | UCMR5 Analytical Results: GUERNSEY CO. WATER DEPT. (OH3000603) |
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 →Guernsey Co. Water Dept.'s phone number on EPA record is 740-432-9200. Its mailing address is GUERNSEY COUNTY COMMISSIONERS, 627 WHEELING AVE, SUITE 300, CAMBRIDGE, OH 43725.
According to EPA's record, Guernsey Co. Water Dept. uses surface water bought from City of Cambridge.
EPA's record shows 4 health-based violations for Guernsey Co. Water Dept. 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 April 2024. EPA also lists 3 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Guernsey Co. Water Dept.'s latest lead and copper round, which ended in December 2023. The federal action level is 15 µg/L.
PurityMap has no verified website for Guernsey Co. Water Dept.. Its phone number on EPA record is 740-432-9200. Its mailing address on EPA record is GUERNSEY COUNTY COMMISSIONERS, 627 WHEELING AVE, SUITE 300, CAMBRIDGE, OH 43725. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.