The Water Map

Microbial

Total Coliform in U.S. tap water

605 public water systems across 35 U.S. states report Total Coliform in their annual Consumer Confidence Report. None currently sit at or above the federal limit.

605
systems measuring
0
over the limit
35
states represented

What it is

A group of bacteria used as an indicator of overall water-system sanitation.

Why it's regulated

Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.

Federal limit0 · MCLG

Within the federal limit (302)

Water systemMeasured
Adelanto, City of — Adelanto, Ca, CA
2023 annual report
0
Albuquerque, NM
2024 annual report
0 %
Alco Water Service — Salinas, Ca, CA
2023 annual report
0
Alpine Springs Mobile Home Park — Palmdale, Ca, CA
2020 annual report
0
Amelano Manor, MD
2024 annual report
0
Aqua J. Mutual Water Company — Lancaster, Ca, CA
2020 annual report
0
Arcata, City of — Arcata, Ca, CA
2023 annual report
0
Aromas Water District — Aromas, Ca, CA
2023 annual report
0
Arrowhead Villas Mutual Service Company — Skyforest, Ca, CA
2023 annual report
0 %
Augusta, GA
2024 annual report
0
Banning, City of — Banning, Ca, CA
2022 annual report
0 %
Bear Valley Csd — Tehachapi, Ca, CA
2022 annual report
0
Bellflower Home Garden Water Company — Bellflower, Ca, CA
2022 annual report
0
Bellflower Home Garden Water Company — Bellflower, Ca, CA
2020 annual report
0
Bellflower Municipal Water System — Rosemead, Ca, CA
2021 annual report
0
Bellflower Municipal Water System — Rosemead, Ca, CA
2022 annual report
0
Bellflower Municipal Water System — Rosemead, Ca, CA
2023 annual report
0
Benedictine School, MD
2024 annual report
Not detected
Beverly Hills-city, Water Dept. — Beverly Hills, Ca, CA
2023 annual report
Not detected %
Beverly Hills-city, Water Dept. — Beverly Hills, Ca, CA
2021 annual report
0 %
Beverly Hills-city, Water Dept. — Beverly Hills, Ca, CA
2022 annual report
Not detected %
Big Bear City Csd — Big Bear City, Ca, CA
2023 annual report
0
Bighorn - Desert View Water Agency — Yucca Valley, Ca, CA
2023 annual report
0
Bolinas Community Pud — Bolinas, Ca, CA
2023 annual report
0
Borrego Wd — Borrego Springs, Ca, CA
2022 annual report
0
Bradford Estates, MD
2024 annual report
0
Brawley, City of — Brawley, Ca, CA
2023 annual report
0
Cal Am - Bass Lake — Sacramento, Ca, CA
2023 annual report
0
Cal American Water Company - Piru — Rosemead, Ca, CA
2023 annual report
0
Cal American Wc - Las Posas Estates — Rosemead, Ca, CA
2023 annual report
0
Cal American Wc - Rio Plaza — Rosemead, Ca, CA
2023 annual report
0
Cal-am Water Company - East Pasadena — Rosemead, Ca, CA
2021 annual report
0 %
Cal-am Water Company - East Pasadena — Rosemead, Ca, CA
2023 annual report
0
Cal-am Water Coronado — Imperial Beach, Ca, CA
2023 annual report
0
Calexico, City of — Calexico, Ca, CA
2023 annual report
0
Cali Lake Rv Resort — Marina Del Ray, Ca, CA
2020 annual report
0
Calif State Polytechnical Univ - Pomona — Pomona, Ca, CA
2021 annual report
0
Calif State Polytechnical Univ - Pomona — Pomona, Ca, CA
2022 annual report
0
California Conservation Camp #14 — Los Angeles, Ca, CA
2023 annual report
0
California Water Service Co-lake Hughes — San Jose, Ca, CA
2020 annual report
0
California Water Service Co-leona Valley — San Jose, Ca, CA
2020 annual report
0
Calistoga, City of — Calistoga, Ca, CA
2021 annual report
0
Camp Williams-resort Water — Manhattan Beach, Ca, CA
2020 annual report
0
Carlsbad MWD — Carlsbad, Ca, CA
2023 annual report
0 %
Carpinteria Valley Water District — Carpinteria, Ca, CA
2023 annual report
Not detected
Casa Dulce Estates — Agua Dulce, Ca, CA
2023 annual report
0
Casitas Municipal Water Dist — Oak View, Ca, CA
2023 annual report
0
Cedar Mhp, MD
2024 annual report
Not detected
Cedarpines Park Mwc — Cedarpines Park, Ca, CA
2023 annual report
0 %
Centerville C.s.d. — Redding, Ca, CA
2022 annual report
0

Showing 50 of 302. The full list is in the JSON API.

Frequently asked

+What is Total Coliform?

A group of bacteria used as an indicator of overall water-system sanitation. Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.

+What is the federal limit for Total Coliform in drinking water?

The federal MCLG for Total Coliform is 0 . The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.

+How many U.S. water systems have Total Coliform over the federal limit?

Zero of the 605 public water systems in The Water Map dataset currently report Total Coliform at or above its federal limit.

+How can I check if Total Coliform is in my city's tap water?

Search your city on The Water Map (https://www.thewatermap.com/) or browse the list on this page. Every U.S. public water utility is required to publish an annual Consumer Confidence Report that lists every contaminant it measured, including Total Coliform.

See Total Coliform on the map

Color-coded by status across the whole country.

Open the map →