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Community Water System · PWS OH2101412

Del-Co Water Company, Inc.

Delaware, Ohio 43015 - drinking water served from surface water sources to 150,000 people, tracked in EPA SDWIS and UCMR5.

150,000
People served
108
EPA violations
4
Health-based
5 PFAS
UCMR5 result

The verdict

EPA records 108 drinking-water violations at Del-Co Water Company, Inc., 4% of them health-based - above the Ohio per-system average, and UCMR5 testing detected 5 PFAS compounds.

108
Total EPA violations on record
4%
Health-based (MCL / treatment failure)
150,000
People served by this system
5
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Del-Co Water Company, Inc.

Del-Co Water Company, Inc. is a private-owned community water system that delivers drinking water to 150,000 residents in Delaware, Ohio (Delaware County) through 55,000 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 108 total violations for this system , of which 4 (4%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 102 monitoring and reporting violations are on file. The most recent violation on record dates to 2014.

The most frequently cited contaminant at this system is Atrazine, recorded in 9 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 5 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 10.7 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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. Statewide, 204 of 346 UCMR5-tested systems have reported PFAS detections (59%).

Del-Co Water Company, Inc.'s 108 violations sit above the Ohio average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
150,000
Total Violations
108
Health-Based Violations
4
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
55,000
County
Delaware
School/Daycare
No
MCL Violations
0
Monitoring Violations
102
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Atrazine MR 9 2001
LASSO MR 9 2001
Simazine MR 9 2001
Lead and Copper Rule MR 7 2014
Fluoride MR 4 1996
BHC-GAMMA MR 4 1998
Methoxychlor MR 4 1998
Di(2-ethylhexyl) adipate MR 4 1998
OXAMYL MR 4 1998
Di(2-ethylhexyl) phthalate MR 4 1998
Carbofuran MR 4 1998
Pentachlorophenol MR 4 1998
Total Polychlorinated Biphenyls (PCB) MR 4 1998
Asbestos MR 4 1993
Surface Water Treatment Rule TT 4 1994
Benzo(a)pyrene MR 4 1998
Diquat MR 4 1998
Nitrite MR 4 1993
Endothall MR 4 1998
2,4-D MR 4 1998
Picloram MR 4 1998
Arsenic MR 4 1996

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 17 of 290 samples detected PFAS.

Contaminant Date Result MRL Status
PFEESA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
PFDoA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 7/11/2023 8.70 ppt 3.00 ppt Detected
11Cl-PF3OUdS 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
PFDA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFBA 7/11/2023 8.90 ppt 5.00 ppt Detected
6:2 FTS 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFMBA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 7/11/2023 <2.00 ppt 2.00 ppt Not Detected
NFDHA 7/11/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 7/11/2023 6.30 ppt 3.00 ppt Detected
PFTA 7/11/2023 <8.00 ppt 8.00 ppt Not Detected
9Cl-PF3ONS 7/11/2023 <2.00 ppt 2.00 ppt Not Detected
PFOA 7/11/2023 4.20 ppt 4.00 ppt Detected
NMeFOSAA 7/11/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 7/11/2023 <7.00 ppt 7.00 ppt Not Detected
PFBS 7/11/2023 3.50 ppt 3.00 ppt Detected
PFHpA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 7/11/2023 <2.00 ppt 2.00 ppt Not Detected
9Cl-PF3ONS 7/11/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 7/11/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 7/11/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 7/11/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 7/11/2023 <20.00 ppt 20.00 ppt 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 Del-Co 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 OH2101412 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 Del-Co 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
2014 Lead and Copper Rule MR 7 SDWIS / OH2101412 / 5000
2001 Atrazine MR 9 SDWIS / OH2101412 / 2050
2001 LASSO MR 9 SDWIS / OH2101412 / 2051
2001 Simazine MR 9 SDWIS / OH2101412 / 2037
1998 BHC-GAMMA MR 4 SDWIS / OH2101412 / 2010
1998 Methoxychlor MR 4 SDWIS / OH2101412 / 2015
1998 Di(2-ethylhexyl) adipate MR 4 SDWIS / OH2101412 / 2035
1998 OXAMYL MR 4 SDWIS / OH2101412 / 2036
1998 Di(2-ethylhexyl) phthalate MR 4 SDWIS / OH2101412 / 2039
1998 Carbofuran MR 4 SDWIS / OH2101412 / 2046
1998 Pentachlorophenol MR 4 SDWIS / OH2101412 / 2326
1998 Total Polychlorinated Biphenyls (PCB) MR 4 SDWIS / OH2101412 / 2383
1998 Benzo(a)pyrene MR 4 SDWIS / OH2101412 / 2306
1998 Diquat MR 4 SDWIS / OH2101412 / 2032
1998 Endothall MR 4 SDWIS / OH2101412 / 2033

How Del-Co Water Company, Inc. Compares

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

Metric Del-Co Water Company, Inc. Ohio avg Federal benchmark
Total violations 108 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 12.5 Indicates a contaminant exceeded a federal MCL
PFAS detection 5 compounds 59% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 150,000 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 (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 Del-Co Water Company, Inc. water safe to drink?
Del-Co Water Company, Inc. (PWS ID: OH2101412) has 108 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 5 PFAS compounds found. This system serves 150,000 people using Surface Water sources.
How many people does Del-Co Water Company, Inc. serve?
Del-Co Water Company, Inc. serves 150,000 people in Delaware, Ohio. It is a Private-owned system using Surface Water water sources with 55,000 service connections.
What type of violations does Del-Co Water Company, Inc. have?
Del-Co Water Company, Inc. has 108 total violations: 4 health-based violations (MCL exceedances or treatment failures), 102 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Del-Co Water Company, Inc. water?
Yes. UCMR5 testing detected 5 PFAS compounds in Del-Co Water Company, Inc.'s water supply: PFHxA, PFBA, PFPeA, PFOA, PFBS. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Del-Co Water Company, Inc. use?
Del-Co Water Company, Inc. uses Surface Water 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.
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.