Shorewood Water Hardness and Water Quality

Shorewood Water Quality Background

The City of Shorewood MN draws water from the Prairie DuChien-Jordan, Prairie DuChien Group, and Prairie Du Chien-Jordan, and Franconia-Ironton-Galesville aquifers through wells that range from 326-640 feet deep. Shorewood also purchases water from the City of Chanhassen to meet the volume needed by residents and businesses.

Arsenic in Shorewood MN City Water

Shorewood water meets the EPA’s 10ppb limit for Arsenic, but exceeds the health limit of 0ppb. The EPA’s 10ppb limit balances the current understanding of Arsenic’s possible health effects against the costs of removing Arsenic from drinking water.

Private wells in the Shorewood area seem to be at a higher risk for Arsenic with levels ranging from 3-57ppb.

Shorewood Drinking Water Quality Reports

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

2011 Shorewood Water Report
2009 Shorewood Water Report
2008 Shorewood Water Report
2007 Shorewood Water Report
2006 Shorewood 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. Inorganic contaminants are mostly consumed through drinking water. They 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 1.0 – 6.87 0 10ppb Skin damage or problems w/ circulatory systems, increased risk of cancer
Barium 0.11 – 0.231 2 2ppm Increase in blood pressure
Fluoride 1.3 – 1.5 4 4ppm Bone disease (pain and tenderness of the bones); children may get mottled teeth
Hard Water 18 – 20gpg NA NA Damage to plumbing, appliances, glassware
Iron 0 – 0.5ppm NA NA Damage to plumbing, appliances, water heaters, laundry
Sodium 20 – 21ppm NA NA Hypertension
Sulfate 8.5 – 23.2ppm 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 0.19 – 0.7 0 80ppb Increased risk of cancer, damage to liver, kidneys, and nervous system
Chlorine 0.5 – 2.4 4 4ppm Eye/nose irritation; stomach discomfort
Chloroform 0.95 – 2.7 5.7 80ppb Nervous system depression, increase in kidney and liver tumors
Dichloroacetic Acid 1.6 – 2.2 0 60ppb Irritant and corrosive to the eyes, skin and respiratory tract
Haloacetic Acids 2.9 – 3.1 0 60ppb Increased risk of cancer
Trihalomethanes 1.9 – 3.4 NA 80ppb Liver, kidney or central nervous system problems; increased risk of cancer


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 8.0 – 11.6 0 15.4pCi/L Increased risk of cancer
Combined Radium 3.8 – 5.8 0 5pCi/L Increased risk of cancer
Radon 927 – 1030 0 NA Increased risk of cancer

This information was compiled from Shorewood'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.