Grand Marsh, WI Water Safety: 53/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
If you're researching Grand Marsh, WI tap water quality, the baseline finding is below average — health-based violations are documented in several service areas, and verifying the specific system at your address is the right next step.
How Grand Marsh Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Grand Marsh Residents
- Homes built before 1986: 57% — older plumbing may contain lead solder.
- Estimated remediation: $400 per household.
- CDC health risk index: 16.35 — above typical levels.
Grand Marsh's Water Providers
Supply infrastructure in Grand Marsh, WI runs through a single dominant provider — the main entity among 1 tracked system through which rate decisions, infrastructure work, and federal compliance are managed.
Overview
We track water quality and home safety data for 1 ZIP code in Grand Marsh, Wisconsin (population ~1,174), covering 1 community water system serving approximately 1,847 people region-wide.
No EPA violations recorded across any ZIP codes in Grand Marsh — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Grand Marsh: D (53/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Grand Marsh water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Grand Marsh
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 53936 | D | ADAMS WATERWORKS | 1,847 |
All ZIP Codes in Grand Marsh
- 53936 [D]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Grand Marsh Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Grand Marsh Infrastructure Age
With 57% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Housing age is one of the most reliable proxies for plumbing-era lead risk, because two federal milestones — the widespread use of lead pipes before 1970 and the continued use of lead solder until 1986 — define the highest-risk tiers of the residential housing stock. With a median build year of 1987, Grand Marsh falls squarely within the older range — meaning a large fraction of the housing was built under the plumbing standards of those earlier eras. The distribution above captures where that risk concentrates, and why older neighborhoods warrant particular attention from residents concerned about tap water quality.
Over half of homes in Grand Marsh were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
How Remediation Costs Compare in Grand Marsh
In Grand Marsh, property wealth outpaces what documented remediation typically demands — the equity burden lands well within the low tier.
Remediation costs in Grand Marsh are relatively low compared to home values. The $0–$800 estimated range is a small fraction of median property value. Home values are 51% below the Wisconsin average.
Grand Marsh: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
In recent monitoring under the Lead and Copper Rule, citywide samples for Grand Marsh have approached or crossed the regulatory action level on multiple occasions. Combined with 57% of stock dating from the pre-rule era, the picture supports baseline single-tap reads as a standard household-level step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Grand Marsh
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. With 57% of homes built before 1986, lead solder is a real possibility.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Grand Marsh, WI