Exceeds EPA Limit Nitrate EXCEEDS EPA LIMIT

Nitrate in Sussex, WI Drinking Water

Nitrate data for Sussex, Wisconsin · 20,202 residents · 1 ZIP code

Nitrate exposure in drinking water is tracked by EPA across the country; households in Sussex, Wisconsin are among those with confirmed detections in the public water record.

10 mg/L (as nitrogen)
EPA MCL
8
EPA Violations
High
Health Risk
Reverse Osmosis or Ion Exchange
Best Filter Method

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-06-04

Nitrate in Sussex Tap Water

Sussex, Wisconsin has 8 EPA violations related to nitrate in drinking water.

This analysis covers 20,202 residents across 1 ZIP code in Sussex.

Sussex's overall water quality grade is C (66/100).

Is Nitrate in Sussex Water Safe?

Nitrate levels in parts of Sussex exceed the EPA MCL of 10 mg/L (as nitrogen). The EPA requires water systems to take corrective action when this limit is exceeded.

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 Sussex

Date Violation Type Status ZIP Code
2025-04-01 Nitrate (Known) Known 53089
2025-01-01 Nitrate (Known) Known 53089
2024-07-01 Nitrate (Known) Known 53089
2024-04-01 Nitrate (Known) Known 53089
2024-01-01 Nitrate (Known) Known 53089
2023-10-01 Nitrate (Known) Known 53089
2023-07-01 Nitrate (Known) Known 53089
2023-04-01 Nitrate (Known) Known 53089

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 Sussex Water

  1. Reverse osmosis is the most effective method for nitrate removal
  2. Ion exchange systems designed for nitrate can also work
  3. Standard carbon filters do NOT remove nitrate
  4. Boiling water increases nitrate concentration — never boil for nitrate

Look for filters certified under NSF 53 / NSF 58 for nitrate removal.

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