Tapcensus

Frontier Development Auth

Community water system in Custer County, Oklahoma, serving 437 people from surface water purchased. 3 rules violated in the past three years, 1 still unresolved. Privately owned.

People served 437 surface water purchased
Rules violated, past 3 years 3 one rule can carry several violations
Unresolved 1 rules still in violation, EPA data updated Oct 7, 2026
Quarters with violations 9 of the last 12 quarters

Quarterly compliance history

VQ3
2023
VQ4
2023
–Q1
2024
–Q2
2024
–Q3
2024
VQ4
2024
VQ1
2025
VQ2
2025
VQ3
2025
VQ4
2025
VQ1
2026
VQ2
2026
UQ3
2026
–No violation identified VViolation identified SSerious violator (EPA enforcement priority) UUndetermined Oldest quarter on the left. Quarters 1 to 12 are the twelve most recent official quarters at EPA's last data refresh; the 13th is the quarter in progress at that refresh, which EPA reports as undetermined.

Still in violation

EPA data updated Oct 7, 2026

Lead and Copper Rule Revisions

Reporting ViolationTreatment Technique Violation Health-based

2 violations, Oct 2024 to open
EPA rule code 351 · 2 violations recorded, 2 still open, 1 health-based

Treatment Technique Violation, health-based: 1 violation, open since Oct 2024. The system did not carry out a required treatment process or corrective action.

Reporting Violation: 1 violation, open since Oct 2024. The system did not report required information on time.

What the rule requires: The 2021 LCRR updated the 1991 LCR with mandatory lead service line inventories and replacement planning, a new 'trigger level' at 10 ppb requiring optimization, and strengthened public education. The 2024 Lead and Copper Rule Improvements (LCRI) further requires replacing all lead service lines within 10 years.

Health effects: Same as Lead and Copper Rule (5000). Violations typically reflect failure to complete the required lead service line inventory or submit a required replacement plan. Lead service lines are the primary source of lead at the tap in many older systems. Limit: Lead action level: 15 ppb (trigger level: 10 ppb); copper action level: 1.3 mg/L

About this rule

Also violated in the past three years

Jul to Sep 2023 to Jul to Sep 2026

Revised Total Coliform Rule

Monitoring Violation

3 violations, Sep 2023 to Mar 2024
EPA rule code 111 · 3 violations recorded

Monitoring Violation: 3 violations, Sep 2023 to Mar 2024. The system did not complete required monitoring. This does not show that a contaminant was found.

What the rule requires: The 2013 RTCR (effective 2016) replaced the original TCR. It triggers automatic E. coli testing whenever total coliform is found. A single E. coli-positive sample is an acute MCL violation. It also requires systems exceeding 5% total coliform-positive samples to conduct a formal assessment and correct any deficiencies, helping prevent contamination before it escalates.

About this rule

Stage 1 Disinfectants and Disinfection Byproducts Rule

Monitoring and Reporting

3 violations, Jul 2023 to Mar 2024 · Chlorine (MRDL)
EPA rule code 210 · 3 violations recorded

Monitoring and Reporting: 3 violations, Jul 2023 to Mar 2024. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.

Contaminant on the record: Chlorine (MRDL).

About this data

Rules violated and the list above come from EPA's SDWIS violation records, one row per violation and contaminant, grouped by the rule each row belongs to. A violation counts when its non-compliance period ended on or after Jul 1, 2023, the start of the thirteen quarters ECHO's three-year figures cover, or is still open; it is unresolved when it was still open at EPA's data refresh on Oct 7, 2026. EPA's rule code 500, "Not Regulated", is left out, as in ECHO's counts. Each rule's violation count is EPA's, and one rule can carry several: a missed monitoring round for a group of contaminants is one violation per contaminant and period. Category names are EPA's violation categories.

ECHO's own summary count of rules violated agrees with this grouping for 98.8% of active systems nationally, and its count of rules being violated for 98.7%; where they differ, the figures here follow the rows listed.

Measured contaminant levels are not part of this record; each system publishes them in its annual Consumer Confidence Report.

Service area from EPA's Public Water System Service Area Boundaries dataset: State agency. The system's location is the centre of the service area EPA publishes for the system.

Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Oklahoma records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.