Community Water System · PWS IL0695000

Hardin County Water District No.1

Cave-IN-Rock, Illinois 62919 - drinking water served from groundwater sources to 843 people, tracked in EPA SDWIS and UCMR5.

Compiled by PlainWater Editorial, Drinking Water Quality Editorial Team · May 15, 2026

843
People served: 337
EPA violations: 18
Health-based: Untested
UCMR5 result

The verdict

EPA records 337 drinking-water violations at Hardin County Water District No.1, 5% of them health-based - above the Illinois per-system average.

337
Total EPA violations on record: 5%
Health-based (MCL / treatment failure): 843
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hardin County Water District No.1

Hardin County Water District No.1 is a local-owned community water system that delivers drinking water to 843 residents in Cave-IN-Rock, Illinois (Hardin County) through 337 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 337 total violations for this system , of which 18 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 304 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 22 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Illinois, EPA tracks 5,117 public water systems serving 12,576,876 people, with 355,322 cumulative violations and 52,932 health-based violations on record. About 81% of systems in the state carry at least one violation, and state-wide the average per system is 69.4 violations. Statewide, 123 of 487 UCMR5-tested systems have reported PFAS detections (25.3%).

Hardin County Water District No.1's 337 violations sit above the Illinois average.

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

843

Total Violations

337

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Community
Owner Type: Local
Connections: 337
County: Hardin
School/Daycare: No
MCL Violations: 18
Monitoring Violations: 304
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Coliform (TCR)	MR	22	2003
Coliform (TCR)	MCL	18	1993
cis-1,2-Dichloroethylene	MR	16	1994
p-Dichlorobenzene	MR	16	1994
trans-1,2-Dichloroethylene	MR	16	1994
1,2-Dichloroethane	MR	16	1994
1,1,1-Trichloroethane	MR	16	1994
Trichloroethylene	MR	16	1994
CHLOROBENZENE	MR	16	1994
Toluene	MR	16	1994
Styrene	MR	16	1994
1,2-Dichloropropane	MR	16	1994
Benzene	MR	16	1994
Ethylbenzene	MR	16	1994
Carbon tetrachloride	MR	16	1994
1,1-Dichloroethylene	MR	16	1994
o-Dichlorobenzene	MR	16	1994
Xylenes, Total	MR	16	1994
Tetrachloroethylene	MR	16	1994
Consumer Confidence Rule	Other	4	2021
DICHLOROMETHANE	MR	3	1994
1,2,4-Trichlorobenzene	MR	3	1994
1,1,2-Trichloroethane	MR	3	1994
Gross Alpha, Excl. Radon and U	MR	1	1977

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 Hardin County Water District No.1.

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 IL0695000 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Illinois Drinking Water Authority

Illinois EPA, Bureau of Water is the primacy agency that licenses and inspects Hardin County Water District No.1 under EPA-delegated authority.

Open IL regulator portal

Source: Illinois EPA, Bureau of Water

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
2021	Consumer Confidence Rule	Other	4	SDWIS / IL0695000 / 7000
2003	Coliform (TCR)	MR	22	SDWIS / IL0695000 / 3100
1994	cis-1,2-Dichloroethylene	MR	16	SDWIS / IL0695000 / 2380
1994	p-Dichlorobenzene	MR	16	SDWIS / IL0695000 / 2969
1994	trans-1,2-Dichloroethylene	MR	16	SDWIS / IL0695000 / 2979
1994	1,2-Dichloroethane	MR	16	SDWIS / IL0695000 / 2980
1994	1,1,1-Trichloroethane	MR	16	SDWIS / IL0695000 / 2981
1994	Trichloroethylene	MR	16	SDWIS / IL0695000 / 2984
1994	CHLOROBENZENE	MR	16	SDWIS / IL0695000 / 2989
1994	Toluene	MR	16	SDWIS / IL0695000 / 2991
1994	Styrene	MR	16	SDWIS / IL0695000 / 2996
1994	1,2-Dichloropropane	MR	16	SDWIS / IL0695000 / 2983
1994	Benzene	MR	16	SDWIS / IL0695000 / 2990
1994	Ethylbenzene	MR	16	SDWIS / IL0695000 / 2992
1994	Carbon tetrachloride	MR	16	SDWIS / IL0695000 / 2982

How Hardin County Water District No.1 Compares

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

Metric	Hardin County Water District No.1	Illinois avg	Federal benchmark
Total violations	337	69.4	SDWA compliance, any non-zero count is a recorded breach
Health-based violations	18	10.3	Indicates a contaminant exceeded a federal MCL
PFAS detection	None	25.3%	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	843	2,458	Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 5,117 regulated public water systems in Illinois.

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 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N)	10 mg/L	Acute health risk for infants

Frequently Asked Questions

Is Hardin County Water District No.1 water safe to drink? ▼

Hardin County Water District No.1 (PWS ID: IL0695000) has 337 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 843 people using Groundwater sources.

How many people does Hardin County Water District No.1 serve? ▼

Hardin County Water District No.1 serves 843 people in Cave-IN-Rock, Illinois. It is a Local-owned system using Groundwater water sources with 337 service connections.

What type of violations does Hardin County Water District No.1 have? ▼

Hardin County Water District No.1 has 337 total violations: 18 health-based violations (MCL exceedances or treatment failures), 304 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Hardin County Water District No.1 water? ▼

No PFAS testing data is available for Hardin County Water District No.1 under the EPA's UCMR5 monitoring program.

What water source does Hardin County Water District No.1 use? ▼

Hardin County Water District No.1 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.

Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

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

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.