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States → Oklahoma

Non-Transient Non-Community Water System · PWS OK5005588

Frontier City

Oklahoma City, Oklahoma 73131 - drinking water served from groundwater sources to 1,040 people, tracked in EPA SDWIS and UCMR5.

1,040
People served
411
EPA violations
21
Health-based
Untested
UCMR5 result

The verdict

EPA records 411 drinking-water violations at Frontier City, 5% of them health-based - above the Oklahoma per-system average.

411
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
1,040
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Frontier City

Frontier City is a private-owned non-transient non-community water system that delivers drinking water to 1,040 residents in Oklahoma City, Oklahoma (Oklahoma County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 411 total violations for this system , of which 21 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 379 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 164 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 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. Statewide, 101 of 166 UCMR5-tested systems have reported PFAS detections (60.8%).

Frontier City's 411 violations sit above the Oklahoma 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
1,040
Total Violations
411
Health-Based Violations
21
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
1
County
Oklahoma
School/Daycare
No
MCL Violations
19
Monitoring Violations
379
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 164 2014
Nitrate-Nitrite MR 77 2024
Arsenic MR 32 2017
Diquat MR 23 2024
Chlorine MR 21 2025
Coliform (TCR) MCL 19 2014
Revised Total Coliform Rule MON 17 2025
Endothall MR 15 2024
Nitrate MR 10 2001
Lead and Copper Rule MR 6 2021
E. COLI MR 6 2024
TTHM MR 4 2019
Total Haloacetic Acids (HAA5) MR 4 2019
LEAD AND COPPER RULE REVISIONS RPT 2 2024
LEAD AND COPPER RULE REVISIONS TT 2 2024

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 Frontier City.

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 OK5005588 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 Chlorine MR 21 SDWIS / OK5005588 / 0999
2025 Revised Total Coliform Rule MON 17 SDWIS / OK5005588 / 8000
2024 Nitrate-Nitrite MR 77 SDWIS / OK5005588 / 1038
2024 Diquat MR 23 SDWIS / OK5005588 / 2032
2024 Endothall MR 15 SDWIS / OK5005588 / 2033
2024 E. COLI MR 6 SDWIS / OK5005588 / 3014
2024 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / OK5005588 / 5200
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / OK5005588 / 5200
2021 Lead and Copper Rule MR 6 SDWIS / OK5005588 / 5000
2019 TTHM MR 4 SDWIS / OK5005588 / 2950
2019 Total Haloacetic Acids (HAA5) MR 4 SDWIS / OK5005588 / 2456
2017 Arsenic MR 32 SDWIS / OK5005588 / 1005
2014 Coliform (TCR) MR 164 SDWIS / OK5005588 / 3100
2014 Coliform (TCR) MCL 19 SDWIS / OK5005588 / 3100
2001 Nitrate MR 10 SDWIS / OK5005588 / 1040

How Frontier City Compares

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

Metric Frontier City Oklahoma avg Federal benchmark
Total violations 411 266.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 21 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 1,040 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 (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 Frontier City water safe to drink? ▼
Frontier City (PWS ID: OK5005588) has 411 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,040 people using Groundwater sources.
How many people does Frontier City serve? ▼
Frontier City serves 1,040 people in Oklahoma City, Oklahoma. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does Frontier City have? ▼
Frontier City has 411 total violations: 21 health-based violations (MCL exceedances or treatment failures), 379 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Frontier City water? ▼
No PFAS testing data is available for Frontier City under the EPA's UCMR5 monitoring program.
What water source does Frontier City use? ▼
Frontier City uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.