Safe Drinking Water
Our systems remove a variety of contaminants that can affect the safety and taste of your water.
Expand each listing to learn more.
Arsenic
| Safe limits | Less than 10 ug/L |
| Sources | Natural deposits or from manufacturing or herbicides |
| Effects |
May cause cancer/low birth weight. May cause bladder, lung, skin, kidney, nasal passage, liver, and prostate cancer. Recent studies in school-age children have reported association between neurological behavior functions and exposure to arsenic via drinking water. |
One in 10 wells contain some Arsenic. Arsenic is a known human carcinogen. It may also cause an increased risk of cardiovascular disease, peripheral neuropathy, skin hyperpigmentation and diabetes. Major exposure occurs when drinking or cooking with contaminated water. Boiling the water concentrates the amount of arsenic in the water and in turn, exposes you to a higher dose of arsenic. More information here.
Bacteria: E. coli and Coliform Bacteria
| Safe limits | Less than 1/100 ml |
| Sources | E. coli: Typically from feces. Coliform Bacteria: Usually from the environment—soil, vegetation, etc. |
| Effects | May cause diarrhea & vomiting. |
Ninety-eight percent of towns with public water systems chlorinate the water because any water supply, well water included, can become contaminated with bacteria. The Maine Center for Disease Control and Prevention recommends testing yearly for coliform bacteria & E. coli through a state certified laboratory. Results are known within 3 to 5 days, and we highly recommend you always chose to get a “count” (not results with just absent/present). More information here.
Chloride
| Safe limits | None per State of Maine 250 mg/L per National Secondary Drinking Water Regulations recommendation |
| Sources | Possible salt intrusion from sea water or naturally occurring deposits in bedrock |
| Effects | Salty taste, unsafe to drink, can damage plumbing and fixtures |
Copper
| Safe limits | Less than 1.3 mg/L |
| Sources | Natural deposits or corrosion household plumbing |
| Effects |
Short term exposure: Gastrointestinal distress Long term exposure: liver or kidney damage |
Fluoride
| Safe limits | Between 0.6 mg/L and 1.7 mg/L |
| Sources | Natural deposits |
| Effects | If too little, increased chance of tooth decay and if too much, stained teeth |
Forever Chemicals | PFAS
| Safe limits | Combined limit 20 PPT |
| Sources | Man-made chemicals from localized industrial sites |
| Effects | All Maine drinking water suppliers are required to test for the six types of PFAs and report the results to the state. Water supplies with more than 20 PPT of the 6 chemicals should treat their water to remove the contaminants or switch to another water source. |
PFAS have been found in Maine in several places including agricultural sites, drinking water supplies, surface waters, landfills, wastewater, sludge, septage spreading sites, and remediation cleanup sites. In general, PFAS can enter the environment through direct releases from specific PFAS-containing products. Some of these are found in food packaging materials, nonstick cookware, stain-resistant carpet treatments, water resistant clothing, cleaning products, paints, varnishes, and sealants, firefighting foams, and some cosmetics from various waste streams. In Maine, sludge and septage that may contain PFAS was applied to various “sites” for nutrient value. This activity was licensed because at the time little was known about PFAS as an emerging contaminant. More information here.
Hardness
| Safe limits |
Degree of Water Hardness Expressed as GPG Expressed as mg/l |
| Sources | Based on the amount of dissolved calcium and magnesium present in water |
| Effects |
Can create scales in cold water piping heated hard water can build up in water heaters, boilers, and other appliances. Unsightly film or scum in tub & other fixtures; usage of more soap is required to clean. Build up on skin & hair; can cause dry skin, brittle hair, skin irritation & clogged pores Graying of whites or loss of brightness in colored laundry. |
If you have hard water, a water softener may be needed. Often, hard water is accompanied by other minerals, so it is best to have your water tested so the appropriate system is installed. More information here.
Iron
| Safe limits | Less than 0.3 mg/L |
| Sources | Natural deposits |
| Effects | Water may appear colored, ranging from light yellow to bright orange, you may also have a smell in the water that can be metallic or a rotten egg smell of sulfur.
Stains fixtures and/or clothes Will build up in plumbing, sometimes to the point of completely blocking pipes. |
Over 25% of the Earth’s crust is iron, therefore, it is one of the most common minerals found in water. Iron will present itself in two different forms: ferric iron is a suspended solid which will make the water appear colored, ranging from light yellow to bright orange in color or ferrous iron which is a dissolved solid and colorless. If allowed exposure to air, ferrous iron may oxidize and appear colored. More information here.
Lead
| Safe limits | Less than 15 ug/L |
| Sources | Corrosion of household plumbing or solder, erosion of natural deposits, brass alloy fixtures |
| Effects |
May cause brain damage. Delay in physical or mental development in children. May cause high blood pressure, kidney problems in adults. |
Manganese
| Safe limits | Less than 0.05 mg/L |
| Sources | Natural deposits—relative of iron |
| Effects |
Black or brown staining of fixtures. Black-brown string or yarn-like substance in toilet tanks. Can impart an unpleasant taste, often bitter or metallic. Higher levels have been linked to impulse control & short fuse response in children. |
If you have Manganese or Hardness in your water, a Water Softener may be needed. Often times, Manganese and Iron will appear together in well water, so it is best to have an evaluation, so the appropriate system is installed. More information here.
Nitrate-N
| Safe limits | Less than 10 mg/L |
| Sources | Runoff from fertilizer use, leaching from septic tanks, sewage, erosion of natural deposits |
| Effects | May cause infant blood problems—Drinking or eating a lot of nitrates can stop red blood cells from doing their job of carrying oxygen. When red blood cells in babies less than 12 months old don’t carry oxygen well, it can make the baby’s skin look bluish or brownish (“Blue Baby Syndrome,” also called methemoglobinemia), and make the baby sick. Symptoms can include bluish skin (cyanosis), rapid heartbeat, shortness of breath, nausea, diarrhea, lethargy, loss of consciousness, and seizures. A high percentage of methemoglobin in the blood can lead to death. |
pH
| Safe limits | 6.5 – 8.5 |
| Sources |
Measures the acidity or alkalinity, pH scale ranges from 0-14 with 7 being neutral. Below 7 is considered acidic and above 7 is considered alkaline. Naturally rainwater is 5.5 on the pH scale. |
| Effects |
Strongly acidic or alkaline water is corrosive and can dissolve toxic materials from plumbing (such as copper piping or lead soldering) that can cause health concerns. Acidic water dissolves copper leaving a tell-tale blue or green staining on fixtures. Corrosive water can lead to costly repair or replacement of plumbing system. Acidic and alkaline water can have an adverse effect on water treatment systems. |
Acidic and alkaline water may also interfere with the effectiveness of other water treatment systems. You will get the most accurate pH test result by testing onsite, right at the kitchen sink. More information here.
Radon
| Safe limits | Less than 4000 pCi/L |
| Sources | Natural deposits—Radon is a gas |
| Effects |
Radon Gas causes lung cancer and is linked to stomach, liver and brain cancer. Chemically damages your DNA. In Maine about 25% of lung cancer deaths have been linked to homes with radon gas in the well water. In Maine up to 1/3 of all wells have radon gas. |
Although the dangers of radon gas in the home have been well publicized over the last several years, few people think of radon coming in through their well water supply.
Radon gas is created when the radioactive mineral radium degrades. Radium leaches from phosphates and other radium bearing rock formations such as granite into the water. Radon will quickly escape from water as soon as it hits the air. As water is running the gas separates from the water and is inhaled. More information here.
Sodium
| Safe limits | Less than 120 mg/L |
| Sources | Metallic element naturally found and highly soluble. |
| Effects | Possible saltwater intrusion could be from sea water or naturally occurring deposits in bedrock.
Salt runoff from plowing roads may sometimes leach into well water (if well is close to road). |
Sulfur
| Safe limits | None |
| Sources | Hydrogen sulfide gas |
| Effects | Water will smell like rotten eggs. Odor will be evident at levels as low as 0.5 mg/L |
Sulfur (also known as hydrogen sulfide gas) can occur naturally in ground water or be produced by plants or other organic substances as they decompose. It is characterized by a signature rotten egg smell. Not only does it impart an offensive taste and odor, but it can even turn certain beverages like scotch and whiskey a black color. Any beverage prepared with the water will be negatively affected.
In the case where water contains iron and hydrogen sulfide gas, they will combine to form iron sulfide, which is black in color. This is an unpleasant smell and may stain clothing and other items. More information here.
Tannins
| Safe limits | None |
| Sources | Comes from decayed vegetation |
| Effects |
As little as .02 and will notice tea colored water. Causes staining and/or build up on fixtures and in plumbing. Tannins in the well water will affect other treatment systems. |
Turbidity
| Safe limits | Less than 5 NTU |
| Sources | Small particles of solid matter, possibly from soil runoff |
| Effects |
Water can appear opaque or cloudy. This could be caused by sand or well ledge shavings in your well water. This may cause plumbing, pressure tanks or hot water tanks, etc. to plug up. |
Uranium
| Safe limits | Less than 30 ug/L |
| Sources | Natural deposits |
| Effects |
May effect kidneys & blood pressure. Cancer risk will be raised if in well water. Uranium is decayed radon, so you should test for radon if uranium is present. |
