Farmington, MI Water Safety: 79/100 (2026)
6 ZIP codes · 3 water systems · Updated 2026-06-03
How does Farmington tap water hold up under EPA scrutiny? Above average for MI — documented violations are uncommon and the safety grade reflects a clean overall record.
How Farmington Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Farmington, MI
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
How ZIP codes in Farmington score across all safety grades.
What You Should Know About Farmington Water
- Average lead level: 0.0015 mg/L.
- Homes built before 1986: 70% — older plumbing may contain lead solder.
- Estimated remediation: $1,500 per household.
- CDC health risk index: 12.28 — above typical levels.
Who Supplies Your Water in Farmington
Multiple utilities divide Farmington, MI's water service — 3 leading providers among 3 on the federal register.
Overview
We track water quality and home safety data for 6 ZIP codes in Farmington, Michigan, covering 3 community water systems serving approximately 92,469 people.
No EPA violations recorded across any ZIP codes in Farmington — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Farmington: B (79/100)
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
Farmington water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0015 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 6 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 48331 | B | City of Farmington, | 11,597 |
| 48332 | B | City of Farmington, | 11,597 |
| 48333 | B | City of Farmington, | 11,597 |
| 48334 | B | Woodbine Subdivision | 375 |
| 48335 | B | City of Farmington, | 11,597 |
| 48336 | B | Woodbine Subdivision | 375 |
All ZIP Codes in Farmington
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.
Health Outcomes in Farmington
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
Housing & Infrastructure in Farmington
With 70% 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
The character of Farmington's housing stock is one of deep historical layering — a median build year of 1978 signals a city built largely before the plumbing era changes of 1986 and 1970. Lead-soldered copper joints and, in the oldest properties, lead service lines are commonly present in this inventory. That context shapes what individual water testing may reveal, particularly in neighborhoods where the oldest housing is concentrated.
Over half of homes in Farmington 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.
Cost Context: What Remediation Means for Farmington Homeowners
While no remediation project is entirely without cost, the relationship between estimated remediation and property values in Farmington is notably favorable — the equity share is small enough that the household financial perspective is one of proportionality rather than pressure, and most homeowners can treat it as routine planning rather than a significant financial event.
Remediation costs in Farmington are relatively low compared to home values. The $733–$2,417 estimated range is a small fraction of median property value. Home values are 80% above the Michigan average.
Lead Exposure Risk for Children in Farmington
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.
70% — that captures the slice of Farmington housing dating from before the federal ban on solder containing lead. It pairs with aggregate utility readings that either approach or cross 0.015 mg/L, the benchmark set under the EPA Lead and Copper Rule. Together, the two figures shift one-home reads into a standard household-level confirmation, particularly for families with kids. A certified lead-removal filter is available through retailer-verified channels if a kit returns results that warrant additional measures.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Farmington
The NFIP claim record for Farmington — 157 filed incidents — reflects genuine, recurring flood exposure rather than an isolated event or two. When a community accumulates flood claims at this volume and carries 83% of its ZIP codes inside FEMA-designated zones, flood history starts to factor into water quality planning in ways it doesn't for lower-exposure areas. Flooding introduces specific contamination pathways — runoff overwhelming treatment facility intake, surface water infiltrating private wells, and pressure disruptions in distribution systems allowing backflow — all of which become more relevant as flood frequency increases.
Farmington has a moderate flood history with 157 FEMA claims averaging $11,288 per payout. 83% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
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. Flood damage can add significantly to the estimated <strong>$1,500</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Farmington, MI