Record-only indicator: D
Not a safety rating. Missing or old measurements can produce a high score.
Coverage: 12/12 mapped systems have a dated lead result; 1/12 have copper results; 3/12 have UCMR monitoring.
| Contaminant | Reported value or bound | Historical comparison value | Interpretation | Status |
|---|---|---|---|---|
| Lead |
2.6 ppbPeriod end: 09/30/2023
|
15 ppb | Largest reported value or bound among mapped systems; not necessarily the largest actual concentration. | At/below comparison value |
| Copper |
1540.0 ppbPeriod end: 12/31/1995
|
1300 ppb | Largest reported value or bound among mapped systems; not necessarily the largest actual concentration. | Above comparison value |
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 | Interpretation | 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 | No standard | 100 ppt | No federal MCL shown |
| 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 |
Public-record summary
Record-only indicator — incomplete or old records can produce a high score. A score of 100 is not a safety finding. Coverage: 12/12 mapped systems have a dated lead result; 1/12 have copper results; 3/12 have UCMR monitoring. Tap water quality in Pewaukee, Wisconsin (53072) receives an record-only indicator of D (Elevated record-based concern) with a score of 53 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 20 points below the Wisconsin state average of 72. The area is served by 12 water systems providing water to approximately 29,070 people, using groundwater sources. Testing has found elevated levels of Copper 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 71 violations, including 31 health-based violations.
Grade D summarizes the records available to this model, not household safety. Missing, bounded or old measurements can produce a high score, including 100. Review coverage, dates and the current utility report before interpreting this indicator.
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
The record-only indicator is D (53/100). It cannot determine whether your tap water is safe. Missing, bounded or old measurements can produce a high score. Check the coverage and sampling dates below and your utility's current notices.
ZIP code 53072 is served by 12 water systems using groundwater sources, providing water to approximately 29,070 people. Groundwater is naturally filtered through rock and soil, often requiring less treatment. However, it can be vulnerable to contamination from underground sources like naturally occurring arsenic, nitrates from agriculture, or PFAS from industrial sites.
The largest reported lead value or bound is 2.6 ppb, for the sampling period ending 09/30/2023. This is a system-level 90th-percentile record, not a measurement at your tap. Compare the sampling date and original utility report before interpreting it.
Yes — 10 PFAS compounds were detected in records associated with water serving Pewaukee, 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 Pewaukee, Wisconsin have received 71 violations in the last 5 years, including 31 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.
This public-record indicator cannot select household treatment. Confirm your supplier, current utility report and tap-testing results first; match any treatment to a certified contaminant-reduction claim and follow its maintenance instructions.
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