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Transient Non-Community Water System · PWS ME0094759

Swan Island Wma

Sidney, Maine 04330 - drinking water served from groundwater sources to 43 people, tracked in EPA SDWIS and UCMR5.

43
People served
78
EPA violations
22
Health-based
Untested
UCMR5 result

The verdict

EPA records 78 drinking-water violations at Swan Island Wma, 28% of them health-based - below the Maine per-system average.

78
Total EPA violations on record
28%
Health-based (MCL / treatment failure)
43
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Swan Island Wma

Swan Island Wma is a state-owned transient non-community water system that delivers drinking water to 43 residents in Sidney, Maine (Sagadahoc County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 78 total violations for this system , of which 22 (28%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 34 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 Revised Total Coliform Rule, recorded in 17 violations (MON). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Maine, EPA tracks 1,864 public water systems serving 936,624 people, with 148,796 cumulative violations and 23,741 health-based violations on record. About 94% of systems in the state carry at least one violation, and state-wide the average per system is 79.8 violations. Statewide, 14 of 41 UCMR5-tested systems have reported PFAS detections (34.1%).

Swan Island Wma's 78 violations sit below the Maine 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
43
Total Violations
78
Health-Based Violations
22
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
State
Connections
1
County
Sagadahoc
School/Daycare
No
MCL Violations
13
Monitoring Violations
34
Treatment Tech Violations
9

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MON 17 2023
Public Notice Other 11 2024
Revised Total Coliform Rule RPT 11 2023
Revised Total Coliform Rule TT 9 2025
Coliform (TCR) MR 8 2014
Coliform (TCR) MCL 8 2015
Revised Total Coliform Rule MCL 5 2023
E. COLI MR 5 2021
Nitrate MR 4 2024

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 Swan Island Wma.

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 ME0094759 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Maine Drinking Water Authority

Maine'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 ME 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 Revised Total Coliform Rule TT 9 SDWIS / ME0094759 / 8000
2024 Public Notice Other 11 SDWIS / ME0094759 / 7500
2024 Nitrate MR 4 SDWIS / ME0094759 / 1040
2023 Revised Total Coliform Rule MON 17 SDWIS / ME0094759 / 8000
2023 Revised Total Coliform Rule RPT 11 SDWIS / ME0094759 / 8000
2023 Revised Total Coliform Rule MCL 5 SDWIS / ME0094759 / 8000
2021 E. COLI MR 5 SDWIS / ME0094759 / 3014
2015 Coliform (TCR) MCL 8 SDWIS / ME0094759 / 3100
2014 Coliform (TCR) MR 8 SDWIS / ME0094759 / 3100

How Swan Island Wma Compares

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

Metric Swan Island Wma Maine avg Federal benchmark
Total violations 78 79.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 22 12.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 34.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 43 502 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,864 regulated public water systems in Maine.

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 Swan Island Wma water safe to drink? ▼
Swan Island Wma (PWS ID: ME0094759) has 78 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 43 people using Groundwater sources.
How many people does Swan Island Wma serve? ▼
Swan Island Wma serves 43 people in Sidney, Maine. It is a State-owned system using Groundwater water sources with 1 service connections.
What type of violations does Swan Island Wma have? ▼
Swan Island Wma has 78 total violations: 22 health-based violations (MCL exceedances or treatment failures), 34 monitoring/reporting violations, and 9 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Swan Island Wma water? ▼
No PFAS testing data is available for Swan Island Wma under the EPA's UCMR5 monitoring program.
What water source does Swan Island Wma use? ▼
Swan Island Wma uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
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.