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Community Water System · PWS ID6210012

Preston Eastside Water Co

Preston, Idaho 83263 - drinking water served from groundwater sources to 120 people, tracked in EPA SDWIS and UCMR5.

120
People served
259
EPA violations
19
Health-based
Untested
UCMR5 result

The verdict

EPA records 259 drinking-water violations at Preston Eastside Water Co, 7% of them health-based - above the Idaho per-system average.

259
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
120
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Preston Eastside Water Co

Preston Eastside Water Co is a private-owned community water system that delivers drinking water to 120 residents in Preston, Idaho (Franklin County) through 42 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 259 total violations for this system , of which 19 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 198 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 Groundwater Rule, recorded in 95 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 Idaho, EPA tracks 2,005 public water systems serving 1,743,912 people, with 104,850 cumulative violations and 19,965 health-based violations on record. About 96% of systems in the state carry at least one violation, and state-wide the average per system is 52.3 violations. Statewide, 40 of 60 UCMR5-tested systems have reported PFAS detections (66.7%).

Preston Eastside Water Co's 259 violations sit above the Idaho 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
120
Total Violations
259
Health-Based Violations
19
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
42
County
Franklin
School/Daycare
No
MCL Violations
12
Monitoring Violations
198
Treatment Tech Violations
7

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Groundwater Rule MR 95 2025
Lead and Copper Rule MR 27 2025
Revised Total Coliform Rule MON 17 2025
Coliform (TCR) MCL 12 2011
Coliform (TCR) MR 12 2004
Groundwater Rule Other 11 2022
LEAD AND COPPER RULE REVISIONS RPT 7 2025
Chlorine MR 6 2024
Public Notice Other 5 2025
Groundwater Rule TT 4 2020
LEAD AND COPPER RULE REVISIONS TT 3 2024
ETHYLENE DIBROMIDE MR 2 1993
1,2-DIBROMO-3-CHLOROPROPANE MR 2 1993
Atrazine MR 2 1993
BHC-GAMMA MR 2 1993
Methoxychlor MR 2 1993
Toxaphene MR 2 1993
Pentachlorophenol MR 2 1993
2,4-D MR 2 1993
2,4,5-TP MR 2 1993
Carbofuran MR 2 1993
Heptachlor MR 2 1993
Chlordane MR 2 1993
Total Polychlorinated Biphenyls (PCB) MR 2 1993
Heptachlor epoxide MR 2 1993
LASSO MR 2 1993
Arsenic MR 1 1979
Nitrate MR 1 1979
Fluoride MR 1 1979
Mercury MR 1 1979

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 Preston Eastside Water Co.

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 ID6210012 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Idaho Drinking Water Authority

Idaho'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 ID 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 Groundwater Rule MR 95 SDWIS / ID6210012 / 0700
2025 Lead and Copper Rule MR 27 SDWIS / ID6210012 / 5000
2025 Revised Total Coliform Rule MON 17 SDWIS / ID6210012 / 8000
2025 LEAD AND COPPER RULE REVISIONS RPT 7 SDWIS / ID6210012 / 5200
2025 Public Notice Other 5 SDWIS / ID6210012 / 7500
2024 Chlorine MR 6 SDWIS / ID6210012 / 0999
2024 LEAD AND COPPER RULE REVISIONS TT 3 SDWIS / ID6210012 / 5200
2023 TTHM MR 1 SDWIS / ID6210012 / 2950
2023 Total Haloacetic Acids (HAA5) MR 1 SDWIS / ID6210012 / 2456
2022 Groundwater Rule Other 11 SDWIS / ID6210012 / 0700
2020 Groundwater Rule TT 4 SDWIS / ID6210012 / 0700
2011 Coliform (TCR) MCL 12 SDWIS / ID6210012 / 3100
2004 Coliform (TCR) MR 12 SDWIS / ID6210012 / 3100
1993 ETHYLENE DIBROMIDE MR 2 SDWIS / ID6210012 / 2946
1993 1,2-DIBROMO-3-CHLOROPROPANE MR 2 SDWIS / ID6210012 / 2931

How Preston Eastside Water Co Compares

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

Metric Preston Eastside Water Co Idaho avg Federal benchmark
Total violations 259 52.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 19 10 Indicates a contaminant exceeded a federal MCL
PFAS detection None 66.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 120 870 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,005 regulated public water systems in Idaho.

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 Preston Eastside Water Co water safe to drink? ▼
Preston Eastside Water Co (PWS ID: ID6210012) has 259 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 120 people using Groundwater sources.
How many people does Preston Eastside Water Co serve? ▼
Preston Eastside Water Co serves 120 people in Preston, Idaho. It is a Private-owned system using Groundwater water sources with 42 service connections.
What type of violations does Preston Eastside Water Co have? ▼
Preston Eastside Water Co has 259 total violations: 19 health-based violations (MCL exceedances or treatment failures), 198 monitoring/reporting violations, and 7 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Preston Eastside Water Co water? ▼
No PFAS testing data is available for Preston Eastside Water Co under the EPA's UCMR5 monitoring program.
What water source does Preston Eastside Water Co use? ▼
Preston Eastside Water Co 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.