Tapcensus

Frederick

Community water system in Tillman County, Oklahoma, serving 3,940 people from surface water. 4 rules violated in the past three years. Owned by local government.

People served 3,940 surface water
Rules violated, past 3 years 4 one rule can carry several violations
Unresolved 0 rules still in violation, EPA data updated Oct 7, 2026
Quarters with violations 8 of the last 12 quarters

Quarterly compliance history

VQ3
2023
VQ4
2023
–Q1
2024
VQ2
2024
–Q3
2024
VQ4
2024
–Q1
2025
–Q2
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.

Rules violated in the past three years

Jul to Sep 2023 to Jul to Sep 2026

Stage 1 Disinfectants and Disinfection Byproducts Rule

Treatment Technique Violation Health-based

1 violation, Jul 2023 to Sep 2023 · Carbon, Total
EPA rule code 210 · 1 violation recorded, 1 health-based

Treatment Technique Violation, health-based: 1 violation, Jul 2023 to Sep 2023. The system did not carry out a required treatment process or corrective action.

Contaminant on the record: Carbon, Total.

Stage 2 Disinfectants and Disinfection Byproducts Rule

Maximum Contaminant Level Violation Health-based

3 violations, Jul 2023 to Jun 2024 · TTHM (Total Trihalomethanes) · 3 measured values
EPA rule code 220 · 3 violations recorded, 3 health-based

Maximum Contaminant Level Violation, health-based: 3 violations, Jul 2023 to Jun 2024. A sample exceeded the maximum contaminant level EPA allows in drinking water.

Measured
TTHM (Total Trihalomethanes) 0.086 MG/L

Limit 0.08 MG/L · Apr to Jun 2024

TTHM (Total Trihalomethanes) 0.089 MG/L

Limit 0.08 MG/L · Oct to Dec 2023

TTHM (Total Trihalomethanes) 0.096 MG/L

Limit 0.08 MG/L · Jul to Sep 2023

Contaminant on the record: TTHM (Total Trihalomethanes).

TTHM (Total Trihalomethanes), health effects: Long-term exposure is associated with increased bladder cancer risk. Some studies link high TTHM exposure to adverse reproductive outcomes. Bromodichloromethane is classified as a possible human carcinogen. Limit: 0.080 mg/L (80 ppb) locational running annual average (LRAA)

Inorganic Chemicals

Maximum Contaminant Level Violation Health-based

4 violations, Jul 2025 to Jun 2026 · Asbestos · 4 measured values
EPA rule code 333 · 4 violations recorded, 4 health-based

Maximum Contaminant Level Violation, health-based: 4 violations, Jul 2025 to Jun 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.

Measured
Asbestos 136 MFL

Limit 7 MFL · Apr to Jun 2026

Asbestos 106 MFL

Limit 7 MFL · Jan to Mar 2026

Asbestos 105 MFL

Limit 7 MFL · Oct to Dec 2025

Asbestos 80 MFL

Limit 7 MFL · Jul to Sep 2025

Contaminant on the record: Asbestos.

Asbestos, health effects: Long-term ingestion of elevated asbestos levels is associated with an increased risk of benign intestinal polyps (mesothelioma from ingestion remains uncertain in the scientific literature). Inhalation risk from drinking water is considered minimal. EPA classifies asbestos as a Group B1 probable human carcinogen based on inhalation data. Limit: 7 million fibers per liter (MFL) — fibers longer than 10 micrometers

Lead and Copper Rule Revisions

Reporting ViolationTreatment Technique Violation Health-based

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

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

Reporting Violation: 1 violation, Oct 2024 to 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

Lead and copper at the tap

The 90th percentile of the tap samples the system collected in its latest monitoring period, against EPA's action level. Levels vary between homes.

Lead 0.0018 mg/L

Action level 0.015 mg/L · Jan 2022 to Dec 2024

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.

A measured value shown with a rule is the sample result EPA recorded with that violation (SDWIS viol_measure), against the limit EPA recorded on the same row (state_mcl), both in EPA's unit as written; violations without a recorded value, such as missed monitoring, show none. Other measured contaminant levels are not part of this record; each system publishes them in its annual Consumer Confidence Report.

Lead and copper are the newest 90th-percentile results in EPA's SDWA data download (LCR_SAMPLES, codes PB90 and CU90), retrieved on Oct 12, 2026: for each monitoring period a system reports the 90th-percentile value of its tap samples, which EPA compares with its action level of 0.015 mg/L for lead and 1.3 mg/L for copper (40 CFR 141.80). A result is not a measurement of any one tap.

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.