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ADAMS COUNTY REGIONAL WD PWS

PWS ID: OH0100012 · WEST UNION, Ohio 45693

ADAMS COUNTY REGIONAL WD PWS serves 21,810 people in WEST UNION, Ohio using Groundwater water sources. It has 21 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: ADAMS COUNTY REGIONAL WD PWS

ADAMS COUNTY REGIONAL WD PWS is a local-owned community water system that delivers drinking water to 21,810 residents in WEST UNION, Ohio (Adams County) through 7,311 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 21 total violations for this system , of which 0 (0%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 13 monitoring and reporting violations are on file. The most recent violation on record dates to 2018.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 9 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Ohio, EPA tracks 4,181 public water systems serving 11,085,226 people, with 288,388 cumulative violations and 52,412 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. ADAMS COUNTY REGIONAL WD PWS's 21 violations sit below the Ohio average. Statewide, 204 of 346 UCMR5-tested systems have reported PFAS detections (59%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
21,810
Total Violations
21
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
7,311
County
Adams
School/Daycare
No
MCL Violations
0
Monitoring Violations
13
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 9 2005
Revised Total Coliform Rule MON 4 2018
Consumer Confidence Rule Other 2 2002

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
4:2 FTS 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 8/8/2024 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 8/8/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
8:2 FTS 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 8/8/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFPeA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 8/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
lithium 8/8/2024 <9 µg/L 9 µg/L Not Detected
NMeFOSAA 8/8/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFTrDA 8/8/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 8/8/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFDA 8/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 2/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 2/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 2/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 2/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 2/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 2/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFOA 2/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 2/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 2/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 2/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 2/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 2/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 2/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 2/6/2025 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 2/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 2/6/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 2/6/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 2/6/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 2/6/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHpA 2/6/2025 <0.003 µg/L 0.003 µg/L Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for ADAMS COUNTY REGIONAL WD PWS.

Federal Source of Truth

EPA SDWIS — Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID OH0100012 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Ohio Drinking Water Authority

Ohio EPA — Division of Drinking and Ground Waters is the primacy agency that licenses and inspects ADAMS COUNTY REGIONAL WD PWS under EPA-delegated authority.

Open OH regulator portal

Source: Ohio EPA — Division of Drinking and Ground Waters

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2018 Revised Total Coliform Rule MON 4 SDWIS / OH0100012 / 8000
2005 Coliform (TCR) MR 9 SDWIS / OH0100012 / 3100
2002 Consumer Confidence Rule Other 2 SDWIS / OH0100012 / 7000

How ADAMS COUNTY REGIONAL WD PWS Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric ADAMS COUNTY REGIONAL WD PWS Ohio avg Federal benchmark
Total violations 21 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 0 12.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 59% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 21,810 2,651 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,181 regulated public water systems in Ohio.

Federal MCL reference — Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is ADAMS COUNTY REGIONAL WD PWS water safe to drink? ▼
ADAMS COUNTY REGIONAL WD PWS (PWS ID: OH0100012) has 21 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 21,810 people using Groundwater sources.
How many people does ADAMS COUNTY REGIONAL WD PWS serve? ▼
ADAMS COUNTY REGIONAL WD PWS serves 21,810 people in WEST UNION, Ohio. It is a Local-owned system using Groundwater water sources with 7,311 service connections.
What type of violations does ADAMS COUNTY REGIONAL WD PWS have? ▼
ADAMS COUNTY REGIONAL WD PWS has 21 total violations: 0 health-based violations (MCL exceedances or treatment failures), 13 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in ADAMS COUNTY REGIONAL WD PWS water? ▼
No. ADAMS COUNTY REGIONAL WD PWS was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does ADAMS COUNTY REGIONAL WD PWS use? ▼
ADAMS COUNTY REGIONAL WD PWS uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial