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Community Water System · PWS AK2130148

Petersburg

Petersburg, Alaska 99833 - drinking water served from surface water sources to 3,218 people, tracked in EPA SDWIS and UCMR5.

3,218
People served
133
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 133 drinking-water violations at Petersburg, 3% of them health-based - below the Alaska per-system average.

133
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
3,218
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Petersburg

Petersburg is a native american-owned community water system that delivers drinking water to 3,218 residents in Petersburg, Alaska through 1,240 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 133 total violations for this system , of which 4 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 42 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 3 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 Alaska, EPA tracks 1,326 public water systems serving 862,218 people, with 267,144 cumulative violations and 13,963 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 201.5 violations. Statewide, 10 of 30 UCMR5-tested systems have reported PFAS detections (33.3%).

Petersburg's 133 violations sit below the Alaska 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
3,218
Total Violations
133
Health-Based Violations
4
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Native American
Connections
1,240
School/Daycare
No
MCL Violations
0
Monitoring Violations
42
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 3 1997
Interim Enhanced Surface Water Treatment Rule MR 3 2005
Surface Water Treatment Rule MR 3 2024
Barium MR 3 1989
Cadmium MR 3 1989
Mercury MR 3 1989
Nitrate MR 3 1989
Selenium MR 3 1989
Fluoride MR 3 1989
Chromium MR 3 1989
Surface Water Treatment Rule TT 2 1999
CARBON, TOTAL TT 2 2006
Arsenic MR 2 1989
Gross Alpha, Excl. Radon and U MR 2 1985
Revised Total Coliform Rule MON 1 2024
Chlorine MR 1 2024
Methoxychlor MR 1 1987
Toxaphene MR 1 1987
2,4-D MR 1 1987
BHC-GAMMA MR 1 1987
Consumer Confidence Rule Other 1 2011
2,4,5-TP MR 1 1987
Endrin MR 1 1987

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 Petersburg.

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 AK2130148 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Alaska Drinking Water Authority

Alaska'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 AK 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
2024 Surface Water Treatment Rule MR 3 SDWIS / AK2130148 / 0200
2024 Revised Total Coliform Rule MON 1 SDWIS / AK2130148 / 8000
2024 Chlorine MR 1 SDWIS / AK2130148 / 0999
2011 Consumer Confidence Rule Other 1 SDWIS / AK2130148 / 7000
2006 CARBON, TOTAL TT 2 SDWIS / AK2130148 / 2920
2005 Interim Enhanced Surface Water Treatment Rule MR 3 SDWIS / AK2130148 / 0300
1999 Surface Water Treatment Rule TT 2 SDWIS / AK2130148 / 0200
1997 Coliform (TCR) MR 3 SDWIS / AK2130148 / 3100
1989 Barium MR 3 SDWIS / AK2130148 / 1010
1989 Cadmium MR 3 SDWIS / AK2130148 / 1015
1989 Mercury MR 3 SDWIS / AK2130148 / 1035
1989 Nitrate MR 3 SDWIS / AK2130148 / 1040
1989 Selenium MR 3 SDWIS / AK2130148 / 1045
1989 Fluoride MR 3 SDWIS / AK2130148 / 1025
1989 Chromium MR 3 SDWIS / AK2130148 / 1020

How Petersburg Compares

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

Metric Petersburg Alaska avg Federal benchmark
Total violations 133 201.5 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 10.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 33.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 3,218 650 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,326 regulated public water systems in Alaska.

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 Petersburg water safe to drink? ▼
Petersburg (PWS ID: AK2130148) has 133 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,218 people using Surface Water sources.
How many people does Petersburg serve? ▼
Petersburg serves 3,218 people in Petersburg, Alaska. It is a Native American-owned system using Surface Water water sources with 1,240 service connections.
What type of violations does Petersburg have? ▼
Petersburg has 133 total violations: 4 health-based violations (MCL exceedances or treatment failures), 42 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Petersburg water? ▼
No PFAS testing data is available for Petersburg under the EPA's UCMR5 monitoring program.
What water source does Petersburg use? ▼
Petersburg 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.
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.