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GRANDFIELD

PWS ID: OK2007103 · GRANDFIELD, Oklahoma 73546

GRANDFIELD serves 1,110 people in GRANDFIELD, Oklahoma using Surface Water water sources. It has 1,231 recorded EPA violations, including 895 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: GRANDFIELD

GRANDFIELD is a local-owned community water system that delivers drinking water to 1,110 residents in GRANDFIELD, Oklahoma (Tillman County) through 595 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 1,231 total violations for this system , of which 895 (73%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 328 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 TTHM, recorded in 429 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Oklahoma, EPA tracks 1,262 public water systems serving 3,699,452 people, with 336,706 cumulative violations and 113,804 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 266.8 violations. GRANDFIELD's 1,231 violations sit above the Oklahoma average. Statewide, 101 of 166 UCMR5-tested systems have reported PFAS detections (60.8%). 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
1,110
Total Violations
1,231
Health-Based Violations
895
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
595
County
Tillman
School/Daycare
No
MCL Violations
895
Monitoring Violations
328
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 429 2024
Nitrate-Nitrite MCL 414 2025
Coliform (TCR) MR 81 2009
Nitrate MCL 51 1997
TTHM MR 26 2023
Nitrate-Nitrite MR 22 2008
Total Haloacetic Acids (HAA5) MR 16 2010
p-Dichlorobenzene MR 8 2007
1,1,2-Trichloroethane MR 8 2007
Tetrachloroethylene MR 8 2007
CHLOROBENZENE MR 8 2007
Benzene MR 8 2007
Ethylbenzene MR 8 2007
1,2,4-Trichlorobenzene MR 8 2007
1,2-Dichloropropane MR 8 2007
Styrene MR 8 2007
DICHLOROMETHANE MR 8 2007
o-Dichlorobenzene MR 8 2007
Toluene MR 8 2007
trans-1,2-Dichloroethylene MR 8 2007
cis-1,2-Dichloroethylene MR 8 2007
Vinyl chloride MR 8 2007
1,2-Dichloroethane MR 8 2007
1,1,1-Trichloroethane MR 8 2007
Carbon tetrachloride MR 8 2007
Trichloroethylene MR 8 2007
Xylenes, Total MR 8 2007
1,1-Dichloroethylene MR 8 2007
Lead and Copper Rule MR 4 2009
Toxaphene MR 4 2008

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 GRANDFIELD.

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 OK2007103 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Oklahoma Drinking Water Authority

Oklahoma's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find OK regulator via EPA SDWIS

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 Nitrate-Nitrite MCL 414 SDWIS / OK2007103 / 1038
2024 TTHM MCL 429 SDWIS / OK2007103 / 2950
2023 TTHM MR 26 SDWIS / OK2007103 / 2950
2010 Total Haloacetic Acids (HAA5) MR 16 SDWIS / OK2007103 / 2456
2010 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 3 SDWIS / OK2007103 / 0600
2009 Coliform (TCR) MR 81 SDWIS / OK2007103 / 3100
2009 Lead and Copper Rule MR 4 SDWIS / OK2007103 / 5000
2008 Nitrate-Nitrite MR 22 SDWIS / OK2007103 / 1038
2008 Toxaphene MR 4 SDWIS / OK2007103 / 2020
2008 2,4-D MR 2 SDWIS / OK2007103 / 2105
2008 BHC-GAMMA MR 2 SDWIS / OK2007103 / 2010
2007 p-Dichlorobenzene MR 8 SDWIS / OK2007103 / 2969
2007 1,1,2-Trichloroethane MR 8 SDWIS / OK2007103 / 2985
2007 Tetrachloroethylene MR 8 SDWIS / OK2007103 / 2987
2007 CHLOROBENZENE MR 8 SDWIS / OK2007103 / 2989

How GRANDFIELD Compares

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

Metric GRANDFIELD Oklahoma avg Federal benchmark
Total violations 1,231 266.8 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 895 90.2 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.8% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,110 2,931 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,262 regulated public water systems in Oklahoma.

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 GRANDFIELD water safe to drink? ▼
GRANDFIELD (PWS ID: OK2007103) has 1231 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,110 people using Surface Water sources.
How many people does GRANDFIELD serve? ▼
GRANDFIELD serves 1,110 people in GRANDFIELD, Oklahoma. It is a Local-owned system using Surface Water water sources with 595 service connections.
What type of violations does GRANDFIELD have? ▼
GRANDFIELD has 1,231 total violations: 895 health-based violations (MCL exceedances or treatment failures), 328 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in GRANDFIELD water? ▼
No PFAS testing data is available for GRANDFIELD under the EPA's UCMR5 monitoring program.
What water source does GRANDFIELD use? ▼
GRANDFIELD 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.

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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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