US Water Score: D
| Contaminant | Detected Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| Lead |
4.5
|
15 ppb | 1 ppb | Warning |
| Copper |
1500.0
|
1300 ppb | 300 ppb |
UCMR5 occurrence results are screening information, not a finding of regulatory compliance or noncompliance. PFAS rules and compliance dates are evolving.
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFHxS | 69.0 ppt | 10 ppt | 10 ppt | Above comparison value |
| PFHxA | 40.0 ppt | No standard | 400 ppt | No federal MCL shown |
| 6:2 FTS | 35.0 ppt | No standard | — | No federal MCL shown |
| PFBS | 27.0 ppt | 2000 ppt | 100 ppt | Below comparison value |
| PFPeA | 24.0 ppt | No standard | — | No federal MCL shown |
| PFPeS | 21.0 ppt | No standard | — | No federal MCL shown |
| PFBA | 13.0 ppt | No standard | 500 ppt | No federal MCL shown |
| PFOS | 12.0 ppt | 4 ppt | 4 ppt | Above comparison value |
Water Quality Summary
Tap water quality in Waukesha, Wisconsin (53186) receives an overall grade of D (Elevated record-based concern) with a score of 54 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 18 points below the Wisconsin state average of 72. Compared to the national average (75), this area scores significantly lower. The area is served by 7 water systems providing water to approximately 70,718 people, using surface water and groundwater sources. Testing has found elevated levels of Lead that warrant attention. Notably, 3 PFAS compounds exceed the EPA final MCL value used for comparison — a significant concern given the persistent nature of these chemicals. Over the past 5 years, water systems here have accumulated 102 violations, including 52 health-based violations.
A score of 54/100 flags significant system-level concerns in the US Water Score model for Waukesha, WI. These may include violations, contaminant levels near or above regulatory limits, or PFAS detections. Review the detailed records, your utility's Consumer Confidence Report, and qualified local guidance.
Health Information
Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.
Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.
Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.
If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.
Copper can leach into water from copper plumbing, especially in newer homes or when water is acidic.
Short-term exposure above 1,300 ppb can cause gastrointestinal distress. Long-term exposure may cause liver or kidney damage. People with Wilson's disease are especially vulnerable.
Copper pipes, fittings, and faucets are the most common source. Corrosive (low-pH) water accelerates copper leaching.
If copper levels are elevated, flush pipes by running water for 15–30 seconds before use. Reverse osmosis and distillation systems effectively remove copper.
Common Questions
Tap water in Waukesha, Wisconsin receives a grade of D (Elevated record-based concern) with a score of 54/100. This indicates significant water quality concerns based on violation history, contaminant levels, or enforcement actions. We recommend reviewing the specific contaminants detected below and considering a certified water filter.
ZIP code 53186 is served by 7 water systems using surface water, groundwater sources, providing water to approximately 70,718 people. Multiple source types mean your water may come from a blend of surface and underground sources.
Lead was reported at 4.5 ppb in public-system records for Waukesha, Wisconsin. This is below the currently applicable EPA action level of 15 ppb, but may be above more protective health guidance; EPA's future LCRI action level is 10 ppb. Household plumbing can materially change tap-level exposure, so consider certified filtration and individual tap testing, especially where children are present.
Yes — 10 PFAS compounds were detected in records associated with water serving Waukesha, Wisconsin, and 3 results exceeded the numerical EPA MCL value used for comparison. UCMR5 occurrence results alone are not a regulatory compliance determination. PFAS rules and compliance timelines are evolving; verify current information with the utility and EPA.
Water systems serving Waukesha, Wisconsin have received 102 violations in the last 5 years, including 52 health-based violations. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.
Based on detected contaminants (lead, PFAS, copper), residents in Waukesha, Wisconsin should consider: Reverse osmosis (RO) system — most effective for PFAS, lead, and other contaminants. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.