Community Water System · PWS ND5301079
Northwest Rural Water District
Williston, North Dakota 58802-1285 - drinking water served from surface water sources to 5,102 people, tracked in EPA SDWIS and UCMR5.
- 5,102
- People served
- 26
- EPA violations
- 0
- Health-based
- 1 PFAS
- UCMR5 result
The verdict
EPA records 26 drinking-water violations at Northwest Rural Water District - below the North Dakota per-system average, and UCMR5 testing detected 1 PFAS compound.
- 26
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
- 5,102
- People served by this system
- 1
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Northwest Rural Water District
Northwest Rural Water District is a private-owned community water system that delivers drinking water to 5,102 residents in Williston, North Dakota (Williams County) through 2,124 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 26 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 21 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.
The most frequently cited contaminant at this system is Coliform (TCR), recorded in 9 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 6.3 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.
Across North Dakota, EPA tracks 368 public water systems serving 712,349 people, with 13,624 cumulative violations and 2,673 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 37 violations. Statewide, 34 of 38 UCMR5-tested systems have reported PFAS detections (89.5%).
Northwest Rural Water District's 26 violations sit below the North Dakota average.
All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 2,124
- County
- Williams
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 21
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 9 | 2004 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2023 |
| Lead and Copper Rule | MR | 4 | 1993 |
| TTHM | MR | 4 | 2023 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 116 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NMeFOSAA | 9/11/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 9/11/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 9/11/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 9/11/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 6/6/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 6/6/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 6/6/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 6/6/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 6/6/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 6/6/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFHpS | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 6/6/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFPeS | 6/6/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 6/6/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFBS | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/6/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFTA | 6/6/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| ADONA | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 6/6/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 6/6/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFNA | 6/6/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 6/6/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 6/6/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/6/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 6/6/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 5/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 5/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 5/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 5/16/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFPeA | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 5/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 5/16/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMPA | 5/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 5/16/2023 | 6.30 ppt | 5.00 ppt | Detected |
| PFNA | 5/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| HFPO-DA | 5/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 5/16/2023 | <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 Northwest Rural Water District.
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 ND5301079 on SDWISSource: EPA SDWIS Federal Reports Search
North Dakota Drinking Water Authority
North Dakota'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 ND 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 |
|---|---|---|---|---|
| 2023 | Total Haloacetic Acids (HAA5) | MR | 4 | SDWIS / ND5301079 / 2456 |
| 2023 | TTHM | MR | 4 | SDWIS / ND5301079 / 2950 |
| 2004 | Coliform (TCR) | MR | 9 | SDWIS / ND5301079 / 3100 |
| 1993 | Lead and Copper Rule | MR | 4 | SDWIS / ND5301079 / 5000 |
How Northwest Rural Water District Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Northwest Rural Water District | North Dakota avg | Federal benchmark |
|---|---|---|---|
| Total violations | 26 | 37 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 0 | 7.3 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | 1 compound | 89.5% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 5,102 | 1,936 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 368 regulated public water systems in North Dakota.
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 Northwest Rural Water District water safe to drink? ▼
How many people does Northwest Rural Water District serve? ▼
What type of violations does Northwest Rural Water District have? ▼
Has PFAS been detected in Northwest Rural Water District water? ▼
What water source does Northwest Rural Water District 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.