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Plymouth Drinking Water Report and Guides

Plymouth City Water Background

The City of Plymouth MN has over 350 miles of water mains, 15 deep water wells with depths ranging from 302-473 feet, six storage facilities and 2 water treatment plants.

Plymouth Water Hardness

Plymouth Water Hardness ranges from 22-24gpg and is rated as “extremely hard” by the USGS. A professional-grade Water Softener or Membrane System is highly recommended to reduce hardness less to protect plumbing, water heaters, and appliances.

Iron and Manganese in Plymouth MN City Water

Well water naturally contains small levels of Iron and Manganese. Levels over 0.3ppm Iron and 0.05ppm Manganese can result in discolored water and staining. High enough levels may also cause taste and odor complaints.

The Chlorine in city water oxidizes Iron. Oxidized Iron CANNOT be removed by a Water Softener, and requires additional filtration.

The city does filter water for Iron and Manganese, but occasionally low levels of 0-0.4ppm iron will bleed through.

Plymouth MN Annual Drinking Water Quality Reports

The City of Plymouth MN conducts regular testing and provides Annual Water Quality Reports. These reports explain the “water contaminants” and levels that have been detected:

2011 Plymouth Water Report
2009 Plymouth Water Report
2008 Plymouth Water Report
2006 Plymouth Water Report
2005 Plymouth Water Report

The EPA has established two standards for additional contaminants in tap water:

MCL: Maximum Contaminant Level – The maximum allowable level of a certain contaminant, aka the “Legal Limit”

MCLG: Maximum Contaminant Level GOAL – The level where studies have found ZERO HEALTH RISKS, aka the “Health Limit”

All water contaminants meet the EPA’s “Legal Limit”. Certain water contaminants exceed the EPA’s Health Limit and have been highlighted:

Inorganic Contaminants

Inorganic contaminants include salts and metals like Hard Water and Copper. Inorganics are mostly consumed through drinking water, and most do not easily pass through skin. Carbon Filters (refrigerator and faucet filters) have virtually ZERO impact on these contaminants. Reverse Osmosis and the LINX Evolution are very effective at removing inorganic contaminants.

Contaminant Levels Found Health Limit Legal Limit Potential Effects
Arsenic 2.07 – 2.35 0 10ppb Skin damage or problems w/ circulatory systems, increased risk of cancer
Barium 0.15 2 2ppm Increase in blood pressure
Fluoride 1.1 – 1.2 4 4ppm Bone disease (pain and tenderness of the bones); children may get mottled teeth
Hard Water 22 – 24gpg NA NA Damage to plumbing, appliances, glassware
Iron 0 – 0.4ppm NA NA Damage to plumbing, appliances, water heaters, laundry
Sodium 12ppm NA NA Hypertension
Sulfates 16.2 – 27ppm NA NA Catharsis, Dehydration from diarrhoea

Disinfectants and Disinfection Byproducts

Disinfectants are added to control bacteria. When disinfectants like Chlorine react with other water contaminants, a new class of compounds are formed called “Disinfection Byproducts. Many of these chemicals can enter the body through inhalation, absorption through skin, and through drinking water. A Whole House Carbon Filter is a good preventative tool in addition to a Drinking Water System for these compounds.

Contaminant Levels Found Health Limit Legal Limit Potential Effects
Bromodichloromethane 4 – 5.9 0 80ppb Increased risk of cancer, damage to liver, kidneys, and nervous system
Chlorine 0.49 – 1.95 4 4ppm Eye/nose irritation; stomach discomfort
Chloroform 8.66 – 14 5.7 80ppb Nervous system depression, increase in kidney and liver tumors
Dibromochloromethane 1.36 – 2.3 0.4 80ppb Increased risk of cancer
Dichloroacetic Acid 3.96 – 5.6 0 60ppb Irritant and corrosive to the eyes, skin and respiratory tract
Haloacetic Acids 4 – 5.1 NA 60ppb Increased risk of cancer
Trihalomethanes 1.2 – 19.3 NA 80ppb Liver, kidney or central nervous system problems; increased risk of cancer

Microbial Contaminants

Bacteria, Virus, and Cysts come from a variety of sources including water main breaks, sewage treatment plants, septic systems, agricultural livestock operations, and wildlife. Microbes are mainly consumed through drinking water. Carbon Filters and Water Softeners do not offer any protection against microbes, but UV Treatment and Ultrafiltration are very effective.

Contaminant Levels Found Health Limit Legal Limit Potential Effects
Total Coliform Bacteria* 1% 0 5% Not a health threat itself; it is used to indicate whether other potentially harmful bacteria may be present

*Upon re-testing, 0% Coliform Bacteria was detected.


Radionuclides may occur naturally, or be the result of oil and gas production or mining activities. These can be inhaled, or consumed through drinking water.

Contaminant Levels Found Health Limit Legal Limit Potential Effects
Alpha Emitters 5.7 0 15.4pCi/L Increased risk of cancer
Combined Radium 0.98 0 5pCi/L Increased risk of cancer
Radon 579 0 NA Increased risk of cancer

This information was compiled from Plymouth’s water treatment reports, the Environmental Protection Agency(EPA), Minnesota Department of Health(DOH), World Health Organization(WHO), and Environmental Working Group(EWG). Please contact us if there are any missing contaminants, or levels that differ from those outlined on this page.

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