St. Louis County Water Department

Find St. Louis County Missouri water departments, districts, authorities, boards, and services. Water departments provide information on drinking water, treatment plants, sewage treatment, water conservation, and testing.


Saint Louis Water Department 1640 South Kingshighway Boulevard St. Louis MO 63110 9.8 miles from St. Louis County 314-633-9000


Missouri State Water Department 200 Sunnydale Drive St. Charles MO 63301 11.4 miles from St. Louis County 636-724-3632

St Peters City Water Department 1 Saint Peters Centre Boulevard St. Peters MO 63376 13.2 miles from St. Louis County 636-477-6600

Cahokia Water Department 600 Levin Drive Cahokia IL 62206 14.2 miles from St. Louis County 618-332-0466

Cahokia Sewer Department 201 West 4th Street Cahokia IL 62206 14.6 miles from St. Louis County 618-332-1222

O'Fallon Water Department 100 North Main Street O'Fallon MO 63366 18.0 miles from St. Louis County 636-281-2858

Pacific City Water Department 205 East Street Louis Street Pacific MO 63069 19.3 miles from St. Louis County 636-257-3770

Collinsville Water Department 300 Simpson Road Collinsville IL 62234 22.4 miles from St. Louis County 618-346-5211

Maryville Water Department 2520 North Center Street Maryville IL 62062 27.2 miles from St. Louis County 618-345-7029

St Clair County Water Department 2031 Mascoutah Avenue Belleville IL 62220 28.5 miles from St. Louis County 618-233-5583

Bethalto Water Department 101 South Prairie Street Bethalto IL 62010 28.7 miles from St. Louis County 618-377-8013

O Fallon Water Department 255 South Lincoln Avenue O'Fallon IL 62269 29.1 miles from St. Louis County 618-624-4500

Crystal City Water Department 130 Mississippi Avenue Crystal MO 63019 29.2 miles from St. Louis County 636-937-6415

Troy Water Department 116 East Market Street Troy IL 62294 31.0 miles from St. Louis County 618-667-9924

Union Water Department 715 Clearview Road Union MO 63084 31.5 miles from St. Louis County 636-584-8534

North East Central County Water Department 7782 Legion Drive Edwardsville IL 62025 34.1 miles from St. Louis County 618-692-0030

Warrenton Water Department 200 West Booneslick Road Warrenton MO 63383 39.7 miles from St. Louis County 636-456-4113

Sullivan Sewer Department 248 East Springfield Road Sullivan MO 63080 48.4 miles from St. Louis County 573-468-4812

Breese Waste Water 1750 South Broadway Breese IL 62230 50.4 miles from St. Louis County 618-526-4070

Springtown Water Department 501 East High Street Potosi MO 63664 52.2 miles from St. Louis County 573-438-7973

About Water Departments

How is drinking water regulated?

The Safe Drinking Water Act sets standards for water quality and safety, and the U.S. Environmental Protection Agency has the authority to enforce the Act. Bottled water is regulated by the U.S. Food and Drug Administration.

Is water from private groundwater wells treated the same as public drinking water systems?

Regulations that protect public drinking water systems do not apply to privately owned wells. Owners of private wells are responsible for ensuring the quality and safety of their well water, including selecting a suitable site for wells and testing for contaminants.

What is a "boil water advisory"?

A boil water advisory is a notification from a government or public health agency to consumers that the drinking water supply may be contaminated with a pathogen. To disinfest water during a boil water advisory, water should be boiled at a rapid boil for at least one minute at sea level or three minutes at high altitudes.