How does Northville tap water hold up under EPA scrutiny? Above average for MI - documented violations are uncommon and the safety grade reflects a clean overall record.

Data: EPA SDWIS

Overview

We track home safety data for 2 ZIP codes in Northville, Michigan (population ~48,320), covering 5 community water systems serving approximately 161,376 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 2 ZIP codes.

2 of 2 ZIP codes with a reported violation count in the available EPA record (100%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.

Home Safety Score

Average Home Safety Score for Northville: A (85/100)

Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:

Factor	What It Measures
Water Quality	EPA violations and compliance history
PFAS MCL Screen	UCMR 5 testing against the covered federal MCLs
Radon Risk	EPA radon zone classification
Annual AQI	EPA AirData county-year median with at least 90 observed days

Water Sources

Northville water systems draw from: Groundwater, Surface water.

Lead & Copper

• Average lead level (90th percentile): 0.0014 mg/L (EPA action level: 0.015 mg/L)
• 0 of 2 ZIP codes with known status exceed the EPA lead action level

Radon Risk

Dominant radon zone: Zone 2 (Moderate Risk)

• Zone 1 (High): 0 ZIP codes
• Zone 2 (Moderate): 1 ZIP code
• Zone 3 (Low): 1 ZIP code

The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.

Top Contaminants

Areas with Most Violations

All ZIP Codes in Northville

• 48167 [B] - 5 violations
• 48168 [A] - 2 violations

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

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Housing Age Profile

Plumbing risk in residential housing tracks directly to construction era: pre-1986 homes may have lead-soldered copper joints; pre-1970 homes may have lead pipes outright. Northville's median build year of 1982 places the city in a moderate risk zone where neither era dominates the housing inventory. Understanding which side of the 1986 threshold a specific property falls on - and whether it predates 1970 - is the most actionable starting point for a homeowner trying to assess their own tap water exposure.

1982

Median Year Built

47%

Pre-1986 (Lead Paint Risk)

13%

Pre-1970 (Lead Pipes Risk)

Pre-1970 (13%) 1970–1986 (34%) Post-1986 (53%)

Most homes in Northville were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.

Source: U.S. Census Bureau ACS B25034.

Cost Context: What Remediation Means for Northville Homeowners

At current valuations, Northville sits in the low remediation-share tier - the equity impact of fixing documented issues is proportionally minor.

Median Home Value

$546,300

Est. Remediation

$1,200

Remediation as % of home value 0.2%

Remediation costs in Northville are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 168% above the Michigan average.

Lead Exposure Risk for Children in Northville

47%

Homes Built Before 1986

0.0014

mg/L Avg Lead (Limit: 0.015)

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.

When older housing represents 47% of the local inventory or aggregate readings approach the federal action level, an in-home check becomes the standard way to translate citywide averages into the specific reality of an individual Northville address.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

Historical NFIP Claim Context in Northville

13

Total FEMA Flood Claims

$22,105

Avg Reported Sum With Payment Data

100%

A/V Share of Claim-Record ZIPs

Historical NFIP data for Northville contains 13 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $22,105. Among ZIP codes with claim records, 100% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.

How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. The <strong>$1,200</strong> remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.

Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.

Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.