The Power of Information

National Drinking Water Database


926 systems serving 6,710,306 people

This drinking water quality report shows results of tests conducted by water utilities in Michigan, provided to the Environmental Working Group (EWG) by the Michigan Department of Environmental Quality. It is part of EWG's national database that includes 47,667 drinking water utilities and 20 million test results from 45 states and the District of Columbia. Water utilities nationwide detected more than 300 pollutants between 2004 and 2009. More than half of these chemicals are unregulated, legal in any amount. Despite this widespread contamination, the federal government invests few resources in protecting rivers, reservoirs, and groundwater from pollution in the first place. The information below summarizes drinking water quality for this state.

Water Utilities
Population Served
Detected Chemicals
Exceed health guidelines*
Exceed Legal Limits*
Unregulated chemicals detected
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

25 Contaminants Exceeding Health Based Limits

Contaminants detected in Michigan drinking water above health guidelines, according to an Environmental Working Group analysis of data obtained from state water authorities

Number of Systems
At Any Level Above Health Limits At Any Level Above Health Limits
Total trihalomethanes (TTHMs)5,742,0515,319,041488273
Total haloacetic acids (HAAs)5,090,5005,021,919298293
Dichloroacetic acid4,048,5224,048,522241241
Lead (total)710,990710,990224224
Arsenic (total)524,299524,299200200
Trichloroacetic acid4,038,187269,64622927

Water Utilities in Michigan Reporting Chemicals Exceeding Health Guidelines

Water utilities in Michigan reporting chemicals exceeding health guidelines, according to an Environmental Working Group analysis of data obtained from state water authorities, include:

Chemicals tested
Chemicals found
Chemicals exceeding
health guidelines
City of Flint124,9431391711
Village of Caseville888741311
South Lyon11,055161210
Pleasant Beach Mobile Home Resort253138159
Negaunee-Ishpeming Authority1139129
Woodland Ridge1,08225128
Waterford Township65,076139148
South Haven5,02172128
Sault Ste Marie14,689129108
City of Rogers City3,3221798
Muskegon Heights12,04912598
Mount Clemens18,4057198
City of Ludington8,35780118
Village of Kalkaska2,22617128

Sources of Michigan Drinking Water Contaminants

The contaminants identified in Michigan drinking water come from a wide variety of sources, including agriculture, industry, water treatment plants, and polluted storm runoff from urban areas.

54Total Contaminants Detected (2007 - 2008)
12Agricultural Pollutants
(pesticides, fertilizer, factory farms)

Nitrate, Arsenic (total), Selenium (total), Nitrite, Atrazine, Ethylbenzene, Dalapon, 1,2-Dichloropropane, Dacthal, p-Dichlorobenzene, Bromomethane, Picloram

17Sprawl and Urban Pollutants
(road runoff, lawn pesticides, human waste)

Nitrate, Copper, Lead (total), Arsenic (total), Tetrachloroethylene, MTBE, Nitrite, Xylenes (total), Dalapon, Cadmium (total), Antimony (total), Dichloromethane (methylene chloride), o-Xylene, Benzene, Dacthal, p-Dichlorobenzene, Methyl ethyl ketone

37Industrial Pollutants

Arsenic (total), Barium (total), Cadmium (total), Chromium (total), Lead (total), Manganese, Nitrate, Nitrite, Selenium (total), Antimony (total), Thallium (total), 1,4-Dioxane, Chloromethane, Methyl ethyl ketone, Methyl isobutyl ketone, MTBE, cis-1,2-Dichloroethylene, Dibromomethane, 2,2-Dichloropropane, Bromochloromethane, Xylenes (total), Dichloromethane (methylene chloride), p-Dichlorobenzene, Vinyl chloride, 1,1-Dichloroethylene, trans-1,2-Dichloroethylene, 1,2-Dichloroethane, 1,1,1-Trichloroethane, 1,2-Dichloropropane, Trichloroethylene, Tetrachloroethylene, Benzene, Toluene, Ethylbenzene, Isopropylbenzene, Styrene, o-Xylene

16Water Treatment and Distribution Byproducts
(pipes and fixtures, treatment chemicals and byproducts)

Total trihalomethanes (TTHMs), Total haloacetic acids (HAAs), Chloroform, Bromodichloromethane, Dibromochloromethane, Dichloroacetic acid, Trichloroacetic acid, Bromoform, Dibromoacetic acid, Monochloroacetic acid, Bromochloroacetic acid, Cadmium (total), Chloromethane, Vinyl chloride, Dibromomethane, Bromochloromethane

10Naturally Occurring
(naturally present but increased for lands denuded by sprawl, agriculture, or industrial development)

Nitrate, Copper, Barium (total), Lead (total), Arsenic (total), Manganese, Chromium (total), Selenium (total), Nitrite, Chloromethane

13Unregulated Contaminants
EPA has not established a maximum legal limit in tapwater for these contaminants

Lead (total), 1,4-Dioxane, Dacthal, Chloromethane, Bromomethane, Methyl ethyl ketone, Methyl isobutyl ketone, MTBE, Dibromomethane, 2,2-Dichloropropane, Bromochloromethane, Bromochloroacetic acid, Isopropylbenzene

Testing Summary for Michigan

The federal government has set standards for some of the pollutants found in tap water supplies.

Contaminants reported as tested by water suppliers in Michigan165
 Contaminants tested due to federal law: 75
 Contaminants tested in addition to those required by federal law: 90

Violation Summary for Michigan

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Michigan since 2004

Violation TypeNumber of Violations
Failure to monitor regularly869
Failure to monitor, Routine Major (Coliform bacteria)362
Maximum contaminant level, Monthly (Coliform bacteria)346
Over maximum contaminant level, Average156
Failure to report information to the public or state agency in the Consumer Confidence Report110
Monitoring and Reporting Disinfection Byproduct Rule88
Failure to monitor, Routine Minor (Coliform bacteria)57
Failure to monitor, Repeat Minor (Coliform bacteria)44
Follow-up and Routine Tap Sampling40
Public Notification Violation for National Primary Drinking Water Regulations39
Operations Report34
Variance/Exemption/Other Compliance24
Record Keeping Violation18
Maximum contaminant level, Acute (Coliform bacteria)15
Failure to monitor, Repeat Major (Coliform bacteria)13
Initial Tap Sampling for Lead and Copper7
Initial Water Quality Parameter Monitoring and Reporting5
Public Education4
Treatment Technique Precursor Removal4
Filter Turbidity Reporting3
Excess Turbidity at 1 NTU3
Treatment Technique (Surface Water Treatment Rule)3
Non-Acute maximum residual disinfectant level3
Treatment Technique No Certif. Operator2
Inadequate reporting of information to the public2
Failure to notify state agency2
Improper Treatment Techniques1
Initial, Follow-up, or Routine Source Water Treatment Monitoring and Reporting1