Tapcensus

Klawock

Community water system in Klawock, Alaska, serving 904 people from surface water. 3 rules violated in the past three years. Owned by tribal government.

People served 904 surface water
Rules violated, past 3 years 3 one rule can carry several violations
Unresolved 0 rules currently in violation, EPA data updated Oct 7, 2026
Quarters with violations 12 of the last 12 quarters

Quarterly compliance history

SQ3
2023
SQ4
2023
SQ1
2024
SQ2
2024
SQ3
2024
SQ4
2024
SQ1
2025
SQ2
2025
SQ3
2025
SQ4
2025
SQ1
2026
SQ2
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

Interim and Long Term 1 Enhanced Surface Water Treatment Rule

Monitoring and Reporting

1 violation, Apr 2024 to Jun 2024 · Interim Enhanced Surface Water Treatment Rule
EPA rule code 122 · 1 violation recorded

Monitoring and Reporting: 1 violation, Apr 2024 to Jun 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: Interim Enhanced Surface Water Treatment Rule.

Surface Water Treatment Rule

Monitoring and Reporting

1 violation, Apr 2024 to Jun 2024
EPA rule code 121 · 1 violation recorded

Monitoring and Reporting: 1 violation, Apr 2024 to Jun 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.

What the rule requires: All systems using surface water (rivers, lakes, reservoirs) or groundwater under surface influence (GWUDI) must filter and disinfect. Treatment technique violations mean the system failed to maintain adequate disinfectant residual, exceeded turbidity limits, or lacked required permits. Snowmelt and storm events can raise turbidity and pathogen loads in surface water.

About this rule

Stage 2 Disinfectants and Disinfection Byproducts Rule

Maximum Contaminant Level Violation Health-based

12 violations, Jul 2023 to Jun 2026 · Total Haloacetic Acids (HAA5) · 12 measured values
EPA rule code 220 · 12 violations recorded, 12 health-based

Maximum Contaminant Level Violation, health-based: 12 violations, Jul 2023 to Jun 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.

Measured
Total Haloacetic Acids (HAA5) 0.067 MG/L

Limit 0.06 MG/L · Apr to Jun 2026

Total Haloacetic Acids (HAA5) 0.073 MG/L

Limit 0.06 MG/L · Jan to Mar 2026

Total Haloacetic Acids (HAA5) 0.08 MG/L

Limit 0.06 MG/L · Oct to Dec 2025

Total Haloacetic Acids (HAA5) 0.087 MG/L

Limit 0.06 MG/L · Jul to Sep 2025

Total Haloacetic Acids (HAA5) 0.092 MG/L

Limit 0.06 MG/L · Apr to Jun 2025

Total Haloacetic Acids (HAA5) 0.093 MG/L

Limit 0.06 MG/L · Jan to Mar 2025

6 more in EPA's record

Contaminant on the record: Total Haloacetic Acids (HAA5).

Total Haloacetic Acids (HAA5), health effects: Dichloroacetic acid is a probable human carcinogen (Group B2). Long-term exposure to trichloroacetic acid may also increase cancer risk. Animal studies show liver, kidney, and reproductive effects at high doses. Limit: 0.060 mg/L (60 ppb) locational running annual average (LRAA)

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 0.0036 mg/L

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

Copper 1.65 mg/L

Action level 1.3 mg/L · Jul to Dec 2005

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): 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. 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 Alaska 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.