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HIGHLAND COUNTY WATER COMPANY, INC.

PWS ID: OH3600514 · HILLSBORO, Ohio 45133

HIGHLAND COUNTY WATER COMPANY, INC. serves 28,421 people in HILLSBORO, Ohio using Groundwater water sources. It has 29 recorded EPA violations, including 7 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: HIGHLAND COUNTY WATER COMPANY, INC.

HIGHLAND COUNTY WATER COMPANY, INC. is a private-owned community water system that delivers drinking water to 28,421 residents in HILLSBORO, Ohio (Highland County) through 11,016 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 29 total violations for this system , of which 7 (24%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 20 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 11 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. HIGHLAND COUNTY WATER COMPANY, INC.'s 29 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
28,421
Total Violations
29
Health-Based Violations
7
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
11,016
County
Highland
School/Daycare
No
MCL Violations
4
Monitoring Violations
20
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 11 2011
Coliform (TCR) MCL 4 2014
Surface Water Treatment Rule TT 3 1993
E. COLI MR 3 2011
Consumer Confidence Rule Other 2 2022
BHC-GAMMA MR 1 1988
Methoxychlor MR 1 1988
Toxaphene MR 1 1988
2,4-D MR 1 1988
2,4,5-TP MR 1 1988
Endrin MR 1 1988

PFAS Testing Results (UCMR5)

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

Contaminant Date Result MRL Status
6:2 FTS 7/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 7/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFPeA 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 7/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 7/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 7/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 7/9/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 7/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 7/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 7/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 7/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOS 7/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeS 7/9/2024 <0.004 µg/L 0.004 µg/L Not Detected
lithium 7/9/2024 <9 µg/L 9 µg/L Not Detected
NFDHA 7/9/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 7/9/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 7/9/2024 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 7/9/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 7/9/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFHpA 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 7/9/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 1/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 1/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 1/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 1/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 1/8/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 1/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 1/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 1/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
lithium 1/8/2024 <9 µg/L 9 µg/L Not Detected
PFNA 1/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 1/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 1/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 1/8/2024 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 1/8/2024 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 1/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 1/8/2024 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 1/8/2024 <0.008 µg/L 0.008 µg/L Not Detected
PFOS 1/8/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 1/8/2024 <0.005 µg/L 0.005 µg/L Not Detected
11Cl-PF3OUdS 1/8/2024 <0.005 µg/L 0.005 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 HIGHLAND COUNTY WATER COMPANY, INC..

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 OH3600514 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 HIGHLAND COUNTY WATER COMPANY, INC. 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
2022 Consumer Confidence Rule Other 2 SDWIS / OH3600514 / 7000
2014 Coliform (TCR) MCL 4 SDWIS / OH3600514 / 3100
2011 Coliform (TCR) MR 11 SDWIS / OH3600514 / 3100
2011 E. COLI MR 3 SDWIS / OH3600514 / 3014
1993 Surface Water Treatment Rule TT 3 SDWIS / OH3600514 / 0200
1988 BHC-GAMMA MR 1 SDWIS / OH3600514 / 2010
1988 Methoxychlor MR 1 SDWIS / OH3600514 / 2015
1988 Toxaphene MR 1 SDWIS / OH3600514 / 2020
1988 2,4-D MR 1 SDWIS / OH3600514 / 2105
1988 2,4,5-TP MR 1 SDWIS / OH3600514 / 2110
1988 Endrin MR 1 SDWIS / OH3600514 / 2005

How HIGHLAND COUNTY WATER COMPANY, INC. Compares

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

Metric HIGHLAND COUNTY WATER COMPANY, INC. Ohio avg Federal benchmark
Total violations 29 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 7 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 28,421 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 HIGHLAND COUNTY WATER COMPANY, INC. water safe to drink? ▼
HIGHLAND COUNTY WATER COMPANY, INC. (PWS ID: OH3600514) has 29 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 28,421 people using Groundwater sources.
How many people does HIGHLAND COUNTY WATER COMPANY, INC. serve? ▼
HIGHLAND COUNTY WATER COMPANY, INC. serves 28,421 people in HILLSBORO, Ohio. It is a Private-owned system using Groundwater water sources with 11,016 service connections.
What type of violations does HIGHLAND COUNTY WATER COMPANY, INC. have? ▼
HIGHLAND COUNTY WATER COMPANY, INC. has 29 total violations: 7 health-based violations (MCL exceedances or treatment failures), 20 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in HIGHLAND COUNTY WATER COMPANY, INC. water? ▼
No. HIGHLAND COUNTY WATER COMPANY, INC. was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does HIGHLAND COUNTY WATER COMPANY, INC. use? ▼
HIGHLAND COUNTY WATER COMPANY, INC. 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