Public Water System

SUN PRAIRIE UTILITIES

PWSID WI1130258 · Wisconsin · 33,966 people served

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SUN PRAIRIE UTILITIES is an EPA-regulated public water system in Wisconsin (PWSID WI1130258). It serves an estimated 33,966 residents — a small city of customers — across 1 community across 1 ZIP code.

Over the past five years, SUN PRAIRIE UTILITIES has recorded 3 EPA health-based violations. The grade of C summarizes this compliance pattern. Specific contaminants, dates, and rule citations are listed in the violation history below.

Service Area

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Centered on the averaged ZIP-code centroid of 1 ZIP served.

Population

33,966

Cities

ZIPs

Violations

EPA Health-Based Violations

Health-based Maximum Contaminant Level (MCL) violations on file for SUN PRAIRIE UTILITIES over the past five years of EPA SDWIS reporting.

Fluoridechemical

EPA Code 1025 · Maximum Contaminant Level Exceedance

violations

EPA Limit

4.0 mg/L

Last Reading

6.8785 MG/L

First Reported

Jan 2023

Most Recent

Jan 2023

What this violation means

Fluoride at the optimal level (~0.7 mg/L) reduces tooth decay, which is why most US utilities add it. The MCL of 4.0 mg/L exists to protect against skeletal fluorosis from naturally high-fluoride groundwater, while the EPA's secondary standard of 2.0 mg/L addresses dental fluorosis in children.

Recommended precautions

→Reverse osmosis removes fluoride; standard carbon filters do NOT.
→If your child uses fluoride toothpaste and drinks fluoridated water, supervise brushing to limit ingestion.
→Bone meal supplements often contain fluoride and should be used cautiously.

Read the complete guide to Fluoride

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Cities Served by SUN PRAIRIE UTILITIES

SUN PRAIRIE

ZIP Codes Served

53590

About this system

EPA records this system as PWSID WI1130258. Data reflects the most recent EPA SDWIS publication as of 2026-05-18. Public Water System Identifiers (PWSIDs) are assigned by the EPA's Safe Drinking Water Act program to track every regulated water utility in the United States. The first two letters typically indicate the state primacy agency. For real-time water quality information, contact SUN PRAIRIE UTILITIES directly or review their annual Consumer Confidence Report (CCR).