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Community Water System · PWS AS9710855

Masefau ASG

Pago Pago, American Samoa 96799 - drinking water served from groundwater sources to 457 people, tracked in EPA SDWIS and UCMR5.

457
People served
34
EPA violations
1
Health-based
Untested
UCMR5 result

The verdict

EPA records 34 drinking-water violations at Masefau ASG, 3% of them health-based - above the American Samoa per-system average.

34
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
457
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Masefau ASG

Masefau ASG is a state-owned community water system that delivers drinking water to 457 residents in Pago Pago, American Samoa (Eastern District County) through 89 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 34 total violations for this system , of which 1 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 26 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 Combined Radium (-226 and -228), recorded in 7 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 American Samoa, EPA tracks 91 public water systems serving 50,626 people, with 1,883 cumulative violations and 238 health-based violations on record. About 22% of systems in the state carry at least one violation, and state-wide the average per system is 20.7 violations. Statewide, 1 of 1 UCMR5-tested systems have reported PFAS detections (100%).

Masefau ASG's 34 violations sit above the American Samoa 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
457
Total Violations
34
Health-Based Violations
1
Water Source
Groundwater

System Details

System Type
Community
Owner Type
State
Connections
89
County
Eastern District
School/Daycare
No
MCL Violations
1
Monitoring Violations
26
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MR 7 2014
Total Haloacetic Acids (HAA5) MR 4 2023
TTHM MR 4 2023
Consumer Confidence Rule Other 4 2022
Lead and Copper Rule MR 3 2014
Asbestos MR 2 2025
E. COLI MR 2 2023
Nitrate MR 2 2023
Gross Beta Particle Activity MR 1 2012
Coliform (TCR) MCL 1 2011
Coliform (TCR) MR 1 2013

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 Masefau ASG.

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 AS9710855 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

American Samoa Drinking Water Authority

American Samoa'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 AS 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 Asbestos MR 2 SDWIS / AS9710855 / 1094
2023 Total Haloacetic Acids (HAA5) MR 4 SDWIS / AS9710855 / 2456
2023 TTHM MR 4 SDWIS / AS9710855 / 2950
2023 E. COLI MR 2 SDWIS / AS9710855 / 3014
2023 Nitrate MR 2 SDWIS / AS9710855 / 1040
2022 Consumer Confidence Rule Other 4 SDWIS / AS9710855 / 7000
2014 Combined Radium (-226 and -228) MR 7 SDWIS / AS9710855 / 4010
2014 Lead and Copper Rule MR 3 SDWIS / AS9710855 / 5000
2013 Coliform (TCR) MR 1 SDWIS / AS9710855 / 3100
2012 Gross Beta Particle Activity MR 1 SDWIS / AS9710855 / 4100
2011 Coliform (TCR) MCL 1 SDWIS / AS9710855 / 3100

How Masefau ASG Compares

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

Metric Masefau ASG American Samoa avg Federal benchmark
Total violations 34 20.7 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 1 2.6 Indicates a contaminant exceeded a federal MCL
PFAS detection None 100% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 457 556 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 91 regulated public water systems in American Samoa.

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 Masefau ASG water safe to drink? ▼
Masefau ASG (PWS ID: AS9710855) has 34 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 457 people using Groundwater sources.
How many people does Masefau ASG serve? ▼
Masefau ASG serves 457 people in Pago Pago, American Samoa. It is a State-owned system using Groundwater water sources with 89 service connections.
What type of violations does Masefau ASG have? ▼
Masefau ASG has 34 total violations: 1 health-based violations (MCL exceedances or treatment failures), 26 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Masefau ASG water? ▼
No PFAS testing data is available for Masefau ASG under the EPA's UCMR5 monitoring program.
What water source does Masefau ASG use? ▼
Masefau ASG uses Groundwater 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.