OAKFIELD WATERWORKS
PWS ID: WI4200475 · OAKFIELD, Wisconsin 53065-0098
OAKFIELD WATERWORKS serves 1,058 people in OAKFIELD, Wisconsin using Groundwater water sources. It has 37 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: OAKFIELD WATERWORKS
OAKFIELD WATERWORKS is a local-owned community water system that delivers drinking water to 1,058 residents in OAKFIELD, Wisconsin (Fond du Lac County) through 391 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 37 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 30 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.
The most frequently cited contaminant at this system is Nitrate, recorded in 8 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 Wisconsin, EPA tracks 10,988 public water systems serving 5,131,439 people, with 285,161 cumulative violations and 58,688 health-based violations on record. About 72% of systems in the state carry at least one violation, and state-wide the average per system is 26 violations. OAKFIELD WATERWORKS's 37 violations sit above the Wisconsin average. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%). 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
- 391
- County
- Fond du Lac
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 30
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 8 | 1998 |
| Lead and Copper Rule | MR | 6 | 2012 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2008 |
| TTHM | MR | 4 | 2008 |
| Coliform (TCR) | MR | 4 | 1996 |
| Revised Total Coliform Rule | MON | 4 | 2019 |
| Public Notice | Other | 1 | 2010 |
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 OAKFIELD WATERWORKS.
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 WI4200475 on SDWISSource: EPA SDWIS Federal Reports Search
Wisconsin Drinking Water Authority
Wisconsin DNR — Drinking Water and Groundwater is the primacy agency that licenses and inspects OAKFIELD WATERWORKS under EPA-delegated authority.
Open WI regulator portalViolation 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 |
|---|---|---|---|---|
| 2019 | Revised Total Coliform Rule | MON | 4 | SDWIS / WI4200475 / 8000 |
| 2012 | Lead and Copper Rule | MR | 6 | SDWIS / WI4200475 / 5000 |
| 2010 | Public Notice | Other | 1 | SDWIS / WI4200475 / 7500 |
| 2008 | Total Haloacetic Acids (HAA5) | MR | 4 | SDWIS / WI4200475 / 2456 |
| 2008 | TTHM | MR | 4 | SDWIS / WI4200475 / 2950 |
| 1998 | Nitrate | MR | 8 | SDWIS / WI4200475 / 1040 |
| 1996 | Coliform (TCR) | MR | 4 | SDWIS / WI4200475 / 3100 |
How OAKFIELD WATERWORKS Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | OAKFIELD WATERWORKS | Wisconsin avg | Federal benchmark |
|---|---|---|---|
| Total violations | 37 | 26 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 0 | 5.3 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 38.6% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 1,058 | 467 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 10,988 regulated public water systems in Wisconsin.
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 |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
Is OAKFIELD WATERWORKS water safe to drink? ▼
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Related Data for Wisconsin
Read our methodology — how this data is sourced, computed, and verified.