Nitrate in Brookfield, WI Drinking Water
Nitrate data for Brookfield, Wisconsin · 45,197 residents · 3 ZIP codes
At elevated levels, Nitrate is a recognized health concern in drinking water; in Brookfield, Wisconsin, it has been detected in recent samples logged through federal compliance reporting.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-06-04
Nitrate in Brookfield Tap Water
Brookfield, Wisconsin has 9 EPA violations related to nitrate in drinking water.
This analysis covers 45,197 residents across 3 ZIP codes in Brookfield.
Brookfield's overall water quality grade is C (64/100).
Is Nitrate in Brookfield Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or ion exchange filter certified under NSF 53 / NSF 58 and testing your water independently.
EPA Violations for Nitrate in Brookfield
| Date | Violation Type | Status | ZIP Code |
|---|---|---|---|
| 2025-10-01 | Nitrate (Known) | Known | 53045 |
| 2025-07-01 | Nitrate (Known) | Known | 53045 |
| 2025-04-01 | Nitrate (Known) | Known | 53045 |
| 2025-01-01 | Nitrate (Known) | Known | 53045 |
| 2024-10-01 | Nitrate (Known) | Known | 53045 |
| 2024-07-01 | Nitrate (Known) | Known | 53045 |
| 2024-04-01 | Nitrate (Known) | Known | 53045 |
| 2024-01-01 | Nitrate (Known) | Known | 53045 |
| 2023-10-01 | Nitrate (Known) | Known | 53045 |
Health Effects of Nitrate
- Methemoglobinemia ("blue baby syndrome") in infants under 6 months
- Increased risk of colorectal and bladder cancer (long-term)
- Thyroid disease from chronic exposure
- Possible reproductive effects
Health risk severity: High. Governed by the National Primary Drinking Water Regulations.
How Nitrate Gets Into Drinking Water
- Agricultural fertilizer runoff
- Animal feedlot operations and manure
- Septic system leachate
- Urban stormwater and wastewater discharge
What to Do About Nitrate in Brookfield Water
- Reverse osmosis is the most effective method for nitrate removal
- Ion exchange systems designed for nitrate can also work
- Standard carbon filters do NOT remove nitrate
- Boiling water increases nitrate concentration — never boil for nitrate
Look for filters certified under NSF 53 / NSF 58 for nitrate removal.