WaterQ

Maine Tap Water Quality Rankings 2026: 13th in Nation | WaterQ

Alex Carter
By Alex Carter
Water Quality Researcher ยท Published 2026-06-23

Maine ranks 13th out of 50 states for drinking water quality, receiving an overall grade of B with an average score of 87. The state's water systems serve a population of 641,655 across a mix of rural and forested New England landscapes.

Key Findings for Maine

Reviewing EPA SDWIS data for 2026, here's what defines Maine's water quality landscape:

  • Maine has 93 water systems that recorded a total of 3,114 violations, reflecting compliance challenges in older small-town infrastructure.
  • As a forested and coastal New England state, local water systems must manage natural organic matter and potential source water contamination.
  • The rural nature of the region means many residents rely on smaller public water systems that face distinct operational and monitoring challenges.

Most Common Contaminants in Maine

Here's what Maine residents should know about the contaminants most relevant to their water:

Arsenic

Naturally occurring arsenic is a common geological contaminant in New England bedrock, which can dissolve into groundwater source supplies.

Disinfection Byproducts

Water systems treating surface water from forested areas can form disinfection byproducts when chlorine reacts with natural organic matter.

Lead

Corrosive water passing through older small-town infrastructure and aging household plumbing can cause lead to leach into drinking water.

Maine's Best and Worst Cities for Water Quality

To see the specific water quality data and violation records for your local area, please view the complete breakdown on our Maine state page. This allows you to explore water system compliance for individual towns and cities. Explore the full breakdown on our Maine water systems page.

What Maine Residents Should Do

Given Maine's 13th place ranking, here's what matters most for residents:

  1. Search for your local water system to review its annual Consumer Confidence Report.
  2. If your home is supplied by a private well, conduct regular testing for arsenic, radon, and bacterial contaminants.
  3. Consider using an appropriate filtration system certified to remove contaminants found in your local supply.
  4. Check the EPA violation history for your public water system to stay informed about recent compliance issues.

Frequently Asked Questions

How does Maine water quality compare to other states?

Maine ranks 13th out of 50 states for drinking water quality, placing it in the upper tier of the country. The state earned an overall grade of B with an average score of 87. This indicates that while the water quality is generally good, there is still room for improvement in some areas.

What are the most common contaminants in Maine tap water?

The most common drinking water concerns in Maine are arsenic, lead, and disinfection byproducts. Arsenic occurs naturally in the region's rock, while lead can leach from older small-town infrastructure. Disinfection byproducts are often created when treating surface water from forested areas.

Is it safe to drink tap water in Maine?

Maine's tap water is generally safe to drink, as reflected by its grade of B and average score of 87. However, because the state has 93 water systems with a combined total of 3,114 violations, safety can vary by local system. Residents should verify their specific water system's status and consider testing if using a private well.

Source: EPA SDWIS 2026 Compliance Data and WaterQ National Database. For more information on our ranking process, visit our state rankings page.