Community Water System · PWS ID6210014
Preston City Of
Preston, Idaho 83263 - drinking water served from groundwater sources to 5,591 people, tracked in EPA SDWIS and UCMR5.
- 5,591
- People served
- 149
- EPA violations
- 12
- Health-based
- No PFAS
- UCMR5 result
The verdict
EPA records 149 drinking-water violations at Preston City Of, 8% of them health-based - above the Idaho per-system average.
- 149
- Total EPA violations on record
- 8%
- Health-based (MCL / treatment failure)
- 5,591
- People served by this system
- 0
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Preston City Of
Preston City Of is a local-owned community water system that delivers drinking water to 5,591 residents in Preston, Idaho (Franklin County) through 2,354 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 149 total violations for this system , of which 12 (8%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 113 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 Public Notice, recorded in 20 violations (Other). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.
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 City Of's 149 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.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 2,354
- County
- Franklin
- School/Daycare
- No
- MCL Violations
- 12
- Monitoring Violations
- 113
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Public Notice | Other | 20 | 2018 |
| Coliform (TCR) | MR | 14 | 2012 |
| Revised Total Coliform Rule | MCL | 10 | 2024 |
| Chlorine | MR | 4 | 2017 |
| Groundwater Rule | MR | 3 | 2017 |
| BHC-GAMMA | MR | 3 | 2017 |
| Methoxychlor | MR | 3 | 2017 |
| Toxaphene | MR | 3 | 2017 |
| Dalapon | MR | 3 | 2017 |
| Diquat | MR | 3 | 2017 |
| Endothall | MR | 3 | 2017 |
| OXAMYL | MR | 3 | 2017 |
| Simazine | MR | 3 | 2017 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2017 |
| Picloram | MR | 3 | 2017 |
| Dinoseb | MR | 3 | 2017 |
| Heptachlor | MR | 3 | 2017 |
| Heptachlor epoxide | MR | 3 | 2017 |
| 2,4-D | MR | 3 | 2017 |
| 2,4,5-TP | MR | 3 | 2017 |
| HEXACHLOROBENZENE | MR | 3 | 2017 |
| Benzo(a)pyrene | MR | 3 | 2017 |
| Pentachlorophenol | MR | 3 | 2017 |
| Total Polychlorinated Biphenyls (PCB) | MR | 3 | 2017 |
| ETHYLENE DIBROMIDE | MR | 3 | 2017 |
| Chlordane | MR | 3 | 2017 |
| Lead and Copper Rule | MR | 3 | 2016 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2017 |
| Carbofuran | MR | 3 | 2017 |
| Hexachlorocyclopentadiene | MR | 3 | 2017 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHxS | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 7/16/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFDA | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 7/16/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/16/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 7/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 4:2 FTS | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 7/16/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 7/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 7/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 7/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 7/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 7/16/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFEESA | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 7/16/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 7/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 7/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 7/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 7/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpA | 7/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 1/21/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| NFDHA | 1/21/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 1/21/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 1/21/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 1/21/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 1/21/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 1/21/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 1/21/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 1/21/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 1/21/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 1/21/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 1/21/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 1/21/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFPeS | 1/21/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 1/21/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 1/21/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 1/21/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 1/21/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFBS | 1/21/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 1/21/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 1/21/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
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 City Of.
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 ID6210014 on SDWISSource: EPA SDWIS Federal Reports Search
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 SDWISViolation 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 | TTHM | MR | 1 | SDWIS / ID6210014 / 2950 |
| 2025 | Total Haloacetic Acids (HAA5) | MR | 1 | SDWIS / ID6210014 / 2456 |
| 2024 | Revised Total Coliform Rule | MCL | 10 | SDWIS / ID6210014 / 8000 |
| 2018 | Public Notice | Other | 20 | SDWIS / ID6210014 / 7500 |
| 2017 | Chlorine | MR | 4 | SDWIS / ID6210014 / 0999 |
| 2017 | Groundwater Rule | MR | 3 | SDWIS / ID6210014 / 0700 |
| 2017 | BHC-GAMMA | MR | 3 | SDWIS / ID6210014 / 2010 |
| 2017 | Methoxychlor | MR | 3 | SDWIS / ID6210014 / 2015 |
| 2017 | Toxaphene | MR | 3 | SDWIS / ID6210014 / 2020 |
| 2017 | Dalapon | MR | 3 | SDWIS / ID6210014 / 2031 |
| 2017 | Diquat | MR | 3 | SDWIS / ID6210014 / 2032 |
| 2017 | Endothall | MR | 3 | SDWIS / ID6210014 / 2033 |
| 2017 | OXAMYL | MR | 3 | SDWIS / ID6210014 / 2036 |
| 2017 | Simazine | MR | 3 | SDWIS / ID6210014 / 2037 |
| 2017 | Di(2-ethylhexyl) phthalate | MR | 3 | SDWIS / ID6210014 / 2039 |
How Preston City Of Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Preston City Of | Idaho avg | Federal benchmark |
|---|---|---|---|
| Total violations | 149 | 52.3 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 12 | 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 | 5,591 | 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 City Of water safe to drink? ▼
How many people does Preston City Of serve? ▼
What type of violations does Preston City Of have? ▼
Has PFAS been detected in Preston City Of water? ▼
What water source does Preston City Of use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
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.