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Minnetonka Water Softener and Drinking Water Guide

The City of Minnetonka has over 260 miles of water mains, 18 deep water wells, 10 storage facilities and 8 water treatment plants.  These treatment plants deliver an average of 8 million gallons of water per day to Minnetonka’s residents and businesses.

Minnetonka city water may sometimes contain small levels Iron and Manganese that bleed through the city’s treatment system.  This level can result in discolored water, staining, and a metallic taste and odor. If rust stains continue to occur, a Whole House Filter may be added to stop the Iron that a Softener cannot.

  • Soft Water
  • National Hardness Average
  • Minnetonka Water Hardness

Minnetonka Water Softener Recommendations

The national average for water hardness is 5gpg (grains per gallon). Minnetonka water hardness is 18gpg, which is almost 4x harder than average.

A water softener will protect your water heater, plumbing, and appliances from hard water damage.  A high efficiency water softener will offer the same protection, but will use far less water and salt.

Apple Valley Water Reports

The City of Apple Valley 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.


The EPA has two standards for drinking water contaminants:

MCL: Maximum Contaminant Level
The legal limit for a certain contaminant

MCLG: Maximum Contaminant Level GOAL
The level with ZERO HEALTH RISKS, aka the “Health Limit”

All water contaminants meet the EPA’s “Legal Limit”. Contaminants that exceed the EPA’s Health Limit have been highlighted below.

Inorganic Contaminants

Inorganic contaminants include natural and manmade salts and metals. You are mostly exposed to inorganics through drinking water, most do not easily pass through skin. Carbon Filters (refrigerator and faucet filters) have almost ZERO impact on these contaminants. Reverse Osmosis very effective at removing inorganic contaminants.

Contaminant Amount Found Health Limit Legal Limit Potential Effects
Arsenic 1.68-2.01 0 10 Skin damage or problems w/ circulatory systems, increased risk of cancer
Barium 0.15-0.17 2 2 Increase in blood pressure
Fluoride 0.99-1.3 4 4 Bone disease;children may get mottled teeth
Nitrate 0.37-0.71 10 10 Blue-baby syndrome

Organic Contaminants

Organic contaminants can come from either natural sources like algae, or man-made chemicals. You can be exposed through drinking water, absorption through skin (bathing), and inhalation. This makes a Hybrid Filter System, or Whole House Carbon Filter a good preventative tool.

Contaminant Amount Found Health Limit Legal Limit Potential Effects
Carbon Tetrachloride 0.15-0.3 0 5 Liver problems; increased risk of cancer
Trichloroethylene 0.03-0.1 0 5 Liver problems; increased risk of cancer

Disinfectants and Disinfection Byproducts

Disinfectants are added to kill bacteria. Disinfectants like Chlorine react with other chemicals and create “Disinfection Byproducts. These chemicals enter the body through inhalation, absorption through skin, and drinking water. A Whole House Carbon Filter is a good preventative tool in addition to a Drinking Water System for these compounds.

Contaminant Amount Found Health Limit Legal Limit Potential Effects
Chlorine 0.2-2.8 4 4 Eye/nose irritation; stomach discomfort
Chloroform 6.94-20 5.7 80 Nervous system depression, increase in kidney and liver tumors
Haloacetic Acids 3.0-10.4 0 80 Increased risk of cancer
Total Trihalomethanes 1.2-25.2 0 60 Increased risk of cancer

Microbial Contaminants

Microbes like bacteria and virus come from a variety of sources. These include water main breaks, leaky septic systems, livestock, and wildlife. Microbial contaminants are mainly consumed through drinking water. Carbon Filters and Water Softeners do not offer any protection against microbes, but UV Treatment is very effective.

Contaminant Amount 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.

Radionuclide Contaminants

Radionuclides in water may occur naturally, or come from oil and gas production or mining activities. These can be inhaled, or consumed through drinking water.

Contaminant Amount Found Health Limit Legal Limit Potential Effects
Alpha Emitter 7.1-12 0 15.4 Increased risk of cancer
Combined Radium 3.7-5.4 0 5 Increased risk of cancer
Radon 26-183 0 NA Increased risk of cancer

This information was compiled from Minnetonka’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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