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Chanhassen Drinking Water Report and Guide

Chanhassen City Water Background

The Chanhassen MN city water department opened in 1965, and now serves up to 8.65 million gallons of tap water a day to nearly 7,000 homes and businesses.

Chanhassen’s water comes from deep wells that contain natural elements like Iron, Manganese, and calcium, in addition to less desirable elements like Arsenic.

Chanhassen Water Hardness

Chanhassen water hardness ranges from 18-21gpg.  This is rated “extremely hard” by the USGS (hard water info).  A High Efficiency Water Softener or Saltless Softener can provide protection against hard water damage.

Iron in Chanhassen Water

Recently a gravity filtration system was implemented to remove the Iron and Manganese that have caused orange/brown stains for so many years.

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

Occasional Iron may pass through the system and build up in the city water mains. This is fixed by periodic “hydrant flushing” to clean out the water system.

Once treated, the Department of Health requires the addition of chlorine and fluoride to the water storage reservoirs.

Chanhassen Water Quality Reports

The City of Chanhassen does regular water testing and publishes the results in Annual Drinking Water Reports. These reports explain which water contaminants, and what levels have been found:
2011 Chanhassen Water Report
2010 Chanhassen Water Report
2009 Chanhassen Water Report
2008 Chanhassen Water Report
2007 Chanhassen Water Report
2006 Chanhassen 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 1.38 – 11.5 0 10ppb Skin damage or problems w/ circulatory systems, increased risk of cancer
Barium .144 – .262 2 2ppm Increase in blood pressure
Fluoride 1.03 4 4ppm Bone disease (pain and tenderness of the bones); children may get mottled teeth
Hard Water 18 – 21gpg NA NA Damage to plumbing, appliances, glassware
Iron 0 – 0.4ppm NA NA Damage to plumbing, appliances, water heaters, laundry
Mercury 0 – 0.1ppm 2 2ppm Kidney damage
Nitrate 0.1ppm 0 10ppm Kidney damage
Sodium 22 – 27ppm NA NA Hypertension
Sulfates 72 – 130ppm NA NA Catharsis, Dehydration from diarrhoea

Organic Contaminants

Organic Contaminants can be from natural sources like algae, or man-made like Ethylbenzene. Many organic chemicals easily pass through the skin, and make a Pureoflow, DMT Hybrid System, or Whole House Carbon Filter a good preventative tool.

Contaminant Levels Found Health Limit Legal Limit Potential Effects
Di(2-ethylhexyl) phthalate 0.28 – 1.4 0 6ppb Reproductive difficulties; liver problems; increased risk of cancer
Ethylbenzene 111.5 – 400 700 700ppb Liver or kidney problems
Styrene 0.17 – 1.3 100 100ppb Liver, kidney, or circulatory problems
Toluene 0.69 – 11 100 100ppb Nervous system, liver, or kidney problems
Xylenes 2.07 – 35 1.8 100ppb Nervous system damage

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 0.08 – 0.7 0 80ppb Increased risk of cancer, damage to liver, kidneys, and nervous system
Chlorine 0.1 – 1.5 4 4ppm Eye/nose irritation; stomach discomfort
Chloroform 0.42 – 2.9 5.7 80ppb Nervous system depression, increase in kidney and liver tumors
Dichloroacetic Acid 0.26 – 1.8 0 60ppb Irritant and corrosive to the eyes, skin and respiratory tract
Haloacetic Acids 1.1 0 60ppb Increased risk of cancer
Trihalomethanes 0.4 – 26 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 3.82 – 14.9 0 15.4pCi/L Increased risk of cancer
Combined Radium 1.8 – 5.9 0 5pCi/L Increased risk of cancer
Radon 210 – 244 0 NA Increased risk of cancer

This information was compiled from Chanhassen’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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