Routine Testing Recommended by the State of Maine

Well-water needs to be tested periodically to ensure its continued potability.  The State of Maine recommends the following schedule of testing in its "Uniform Testing Recommendation".

Also visit the State of Maine "Private Well Water and Testing" webpage.

How Often State of Maine Recommendation (2017)
Annual Nitrate
Every 3-5 Years
Every 3-5 Years Radiological Analysis
Source of Data Maine Statute §2660-T, “Safe Drinking Water from  Residential Private Wells: Uniform Testing Recommendation” (2017)

Other contaminants of concern:

Per- and Polyfluoroalkyl Substances (PFAS)

PFAS have been found in a significant percentage of private wells in Maine and New Hampshire.

In 2021, the State of Maine introduced a mandate for all Public Water Systems to test for PFAS contamination in their wells.  (source: Testing for PFAS in Public Drinking Water Systems). The State of New Hampshire recommends private home wells be tested for PFAS every 3-5 years.

Please visit our PFAS page for more information.

Volatile Organic Compounds (VOCs)

The most common VOCs come from gasoline compounds (such as MtBE and benzene) and industrial solvents. MtBE can be found in well water even in remote areas. The State of New Hampshire recommends testing for VOCs every 3-5 years.

Pesticides and Herbicides

Most states do not routinely recommend testing for pesticides and herbicides because it's expensive.  However, such testing might be warranted if your water has elevated nitrite/nitrate concentrations or if significant amounts of pesticide have been applied near the well.

Source: NHDES "Suggested Water Quality Testing for Private Wells" (3 pg. pdf, 2020)

Specific Well Water Concerns

Stinky water? Staining?  The funky well upta camp?

From the EPA's "Protect Your Home's Water" (website):

Conditions or Nearby Activities: Test for:
Recurring gastro-intestinal illness Coliform bacteria
Household plumbing contains lead pH, lead, copper
Radon in indoor air or region is radon rich Radon
Corrosion of pipes, plumbing Corrosion, pH, lead
Nearby areas of intensive agriculture Nitrate, pesticides, coliform bacteria
Coal or other mining operations nearby Metals, pH, corrosion
Gas drilling operations nearby Chloride, sodium, barium, strontium
Dump, junkyard, landfill, factory, gas station or dry-cleaning operation nearby Volatile organic compounds, total dissolved solids, pH, sulfate, chloride, metals
Odor of gasoline or fuel oil, and near gas station or buried fuel tanks Volatile organic compounds
Objectionable taste or smell Hydrogen sulfide, corrosion, metals, bacteria
Stained plumbing fixtures, laundry Iron, copper, manganese
Salty taste and seawater, or a heavily salted roadway nearby* Chloride, total dissolved solids, sodium
Scaly residues, soaps don’t lather* Hardness
Rapid wear of water treatment equipment* pH, corrosion
Water softener needed to treat hardness* Manganese, iron
Water appears cloudy, frothy or colored* Color, detergents

*This is a "nuisance concern" and not necessarily an immediate health threat. Still, these issues are good to address for aesthetic reasons and to prolong the life of your pipes and/or equipment.

Handout:  Common Rural Well Problems and Some Solutions

aka "Water factors to consider in buying or building a new home"

(from the excellent USGS website Groundwater and the Rural Homewoner)

Tests for Home Businesses and More

The State of Maine requires some small businesses to do annual "Basic Safety" tests on their water if they get their drinking water from surface water or private wells.

The Basic Safety Test list:

Test Result Must Be
Coliform Bacteria Absent
Nitrate Less than 10 mg/L
Nitrite Less than 1.0 mg/L

Maine Child Care Facility and Provider Licensing Well-Water Testing (2021)

Initial Annual Every 5 Years
Coliform Bacteria Coliform Bacteria Fluoride
Nitrate and Nitrite Nitrate and Nitrite Arsenic
Fluoride Lead - "First-Draw"
Arsenic Uranium
Lead - "First-Draw"

Source: 10-148 CMR Ch. 32, Child Care Facility Licensing Rule Child Care Centers, Nursery Schools, Small Child Care Facilities, Other Programs (9/27/21)

10-148 CMR Ch 33, Family Child Care Provider Licensing Rule (5/27/21) 

Please visit our Drinking Water Resources page for useful information such as: