Long Island, ME: High Radon Risk — 40/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
If you're researching Long Island, ME 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 Long Island Compares
Data: EPA SDWIS Last verified: 2026-06-03
Long Island Water: The Quick Version
- Homes built before 1986: 67% — older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 11.38.
Water Systems Serving Long Island
Federal drinking water records identify 1 system operating in Long Island, ME. One of those systems serves the overwhelming majority of residential addresses, concentrating infrastructure management, rate authority, and EPA compliance reporting within a single organization.
Overview
We track water quality and home safety data for 1 ZIP code in Long Island, Maine (population ~300), covering 1 community water system serving approximately 135,068 people region-wide.
No EPA violations recorded across any ZIP codes in Long Island — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Long Island: D (40/100)
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
Long Island water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Long Island
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High 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 |
|---|---|---|---|
| 04050 | D | PORTLAND WATER DISTRICT-GREATER | 135,068 |
All ZIP Codes in Long Island
- 04050 [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.
CDC Health Data for Long Island
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
How Old Is Long Island's Housing Stock?
With 67% 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
Heavily weighted toward older construction, Long Island's housing stock carries a median build year of 1901. That profile puts a majority of homes in the era when lead-soldered copper plumbing was standard practice.
Over half of homes in Long Island 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.
Long Island: Remediation Cost in Perspective
While no remediation project is entirely without cost, the relationship between estimated remediation and property values in Long Island 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 Long Island are relatively low compared to home values. The $800–$1,500 estimated range is a small fraction of median property value. Home values are 78% above the Maine average.
Protecting Children from Lead in Long Island
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.
Older stock in Long Island represents 67% of the inventory, and citywide monitoring runs at or above the federal action level — making an in-home read 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 Long Island
- 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 67% 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 Long Island, ME