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GRAND LAKE ESTATES

PWS ID: OH5400312 · NEW KNOXVILLE, Ohio 45871

GRAND LAKE ESTATES serves 103 people in NEW KNOXVILLE, Ohio using Groundwater water sources. It has 263 recorded EPA violations, including 8 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: GRAND LAKE ESTATES

GRAND LAKE ESTATES is a private-owned community water system that delivers drinking water to 103 residents in NEW KNOXVILLE, Ohio (Mercer County) through 68 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 263 total violations for this system , of which 8 (3%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 222 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 33 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 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. GRAND LAKE ESTATES's 263 violations sit above 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
103
Total Violations
263
Health-Based Violations
8
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
68
County
Mercer
School/Daycare
No
MCL Violations
4
Monitoring Violations
222
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 33 2010
Consumer Confidence Rule Other 26 2025
Nitrate MR 14 2004
Lead and Copper Rule MR 12 2016
BHC-GAMMA MR 5 1991
Toxaphene MR 5 1991
2,4-D MR 5 1991
2,4,5-TP MR 5 1991
Endrin MR 5 1991
Methoxychlor MR 5 1991
Atrazine MR 4 2002
Simazine MR 4 2002
Coliform (TCR) MCL 4 2000
1,1,1-Trichloroethane MR 4 2000
1,2-Dichloropropane MR 4 2000
Vinyl chloride MR 4 2000
Trichloroethylene MR 4 2000
Toluene MR 4 2000
Styrene MR 4 2000
trans-1,2-Dichloroethylene MR 4 2000
o-Dichlorobenzene MR 4 2000
cis-1,2-Dichloroethylene MR 4 2000
Carbon tetrachloride MR 4 2000
Lead and Copper Rule TT 4 2016
Tetrachloroethylene MR 4 2000
Ethylbenzene MR 4 2000
Xylenes, Total MR 4 2000
1,2,4-Trichlorobenzene MR 4 2000
1,2-Dichloroethane MR 4 2000
CHLOROBENZENE MR 4 2000

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 GRAND LAKE ESTATES.

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 OH5400312 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 GRAND LAKE ESTATES 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
2025 Consumer Confidence Rule Other 26 SDWIS / OH5400312 / 7000
2016 Lead and Copper Rule MR 12 SDWIS / OH5400312 / 5000
2016 Lead and Copper Rule TT 4 SDWIS / OH5400312 / 5000
2010 Coliform (TCR) MR 33 SDWIS / OH5400312 / 3100
2004 Nitrate MR 14 SDWIS / OH5400312 / 1040
2004 Nitrite MR 3 SDWIS / OH5400312 / 1041
2004 TTHM MR 1 SDWIS / OH5400312 / 2950
2002 Atrazine MR 4 SDWIS / OH5400312 / 2050
2002 Simazine MR 4 SDWIS / OH5400312 / 2037
2002 LASSO MR 4 SDWIS / OH5400312 / 2051
2000 Coliform (TCR) MCL 4 SDWIS / OH5400312 / 3100
2000 1,1,1-Trichloroethane MR 4 SDWIS / OH5400312 / 2981
2000 1,2-Dichloropropane MR 4 SDWIS / OH5400312 / 2983
2000 Vinyl chloride MR 4 SDWIS / OH5400312 / 2976
2000 Trichloroethylene MR 4 SDWIS / OH5400312 / 2984

How GRAND LAKE ESTATES Compares

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

Metric GRAND LAKE ESTATES Ohio avg Federal benchmark
Total violations 263 69 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 8 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 103 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 GRAND LAKE ESTATES water safe to drink? ▼
GRAND LAKE ESTATES (PWS ID: OH5400312) has 263 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 103 people using Groundwater sources.
How many people does GRAND LAKE ESTATES serve? ▼
GRAND LAKE ESTATES serves 103 people in NEW KNOXVILLE, Ohio. It is a Private-owned system using Groundwater water sources with 68 service connections.
What type of violations does GRAND LAKE ESTATES have? ▼
GRAND LAKE ESTATES has 263 total violations: 8 health-based violations (MCL exceedances or treatment failures), 222 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in GRAND LAKE ESTATES water? ▼
No PFAS testing data is available for GRAND LAKE ESTATES under the EPA's UCMR5 monitoring program.
What water source does GRAND LAKE ESTATES use? ▼
GRAND LAKE ESTATES 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. This data is provided for informational purposes only.

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

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