Water Quality in 53018 — Delafield, WI
EPA data for DELAFIELD SQUARE
Data source: U.S. Environmental Protection Agency (EPA) SDWIS Last verified: March 16, 2026
Your Water System
ZIP code 53018 in Delafield, Wisconsin is served by DELAFIELD SQUARE (EPA ID: WI2685812). This system provides water to approximately 587 people from groundwater sources.
There are 21 community water systems serving this area.
Lead & Copper in Your Water
No Lead & Copper Rule sampling data available for systems serving this ZIP code.
Violation Summary
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| January 1, 2025 | Stage 1 DBP Rule | Monitoring | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| October 17, 2024 | Lead and Copper Rule | Monitoring | Unresolved |
| October 17, 2024 | Lead and Copper Rule | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for water systems serving this ZIP code:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 8 | No |
| Revised Total Coliform Rule | Microbiological | 4 | No |
| Stage 1 DBP Rule | Treatment Technique | 3 | No |
| Chlorine residual | Disinfectant | 2 | Yes |
| Stage 2 DBP Rule | Treatment Technique | 2 | Yes |
| Lead and Copper Rule | Treatment Technique | 2 | No |
Need help with your water quality?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| DELAFIELD SQUARE | WI2685812 | 587 | Groundwater |
| NASHOTAH HOUSE | WI2682512 | 350 | Groundwater |
| ST JOHNS NORTHWESTERN ACADEMIES | WI2680761 | 340 | Groundwater |
| DELAFIELD WATERWORKS | WI2684642 | 300 | Groundwater |
| ARBORS | WI2682795 | 280 | Groundwater |
What You Can Do
- Request your water system’s Consumer Confidence Report (CCR) — Your utility is required to publish this annually
- Consider a home water test — Independent testing can reveal issues in your specific plumbing
- Install a certified water filter — NSF-certified filters can address specific contaminants
- Contact your water provider — Ask about current treatment and any ongoing remediation
Need help with water testing or filtration?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Other Water Quality Reports in Wisconsin
- 53001 (Adell) — 2 violations
- 53002 (Allenton)
- 53004 (Belgium) — 2 violations
- 53005 (Brookfield) — 22 violations
- 53006 (Brownsville) — 4 violations
- 53007 (Butler) — 5 violations
- 53010 (Campbellsport) — 26 violations
- 53011 (Cascade)
- 53012 (Cedarburg)
- 53013 (Cedar Grove)
- 53014 (Chilton) — 4 violations
- 53015 (Cleveland) — 2 violations
- 53016 (Clyman) — 3 violations
- 53017 (Colgate)
- 53019 (Eden)
- 53020 (Elkhart Lake)
- 53051 (Menomonee Falls) — 1 violation
- 53061 (New Holstein) — 4 violations
- 53081 (Sheboygan) — 10 violations
- 53090 (West Bend) — 380 violations
Nearby Water Quality Reports
- 53186 (Waukesha) — 10 mi — 302 violations
- 53017 (Colgate) — 13 mi
- 53146 (New Berlin) — 13 mi — 1 violation
- 53005 (Brookfield) — 15 mi — 22 violations
- 53051 (Menomonee Falls) — 16 mi — 1 violation
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for DELAFIELD SQUARE (WI2685812) on EPA.gov.
Frequently Asked Questions
Is the tap water in 53018 safe to drink?
Delafield’s water system has recorded 3 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
Where does 53018’s water come from?
The primary water source for this area is groundwater. DELAFIELD SQUARE serves approximately 587 people.
How can I get my water tested?
Contact your local water utility for a free water quality report, or hire a certified lab for independent home water testing. The EPA recommends testing annually if you use a private well.
Does 53018 have lead in the water?
No Lead and Copper Rule sampling data is currently available in EPA records for water systems serving ZIP code 53018. If you are concerned about lead, contact your water utility or have your tap water independently tested.
What is the radon risk in 53018?
Radon zone data is not available for ZIP code 53018. The EPA recommends testing all homes for radon regardless of location, as radon levels can vary significantly even within the same neighborhood.