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Breaking News

Health Advisory

Last updated: October 16, 2017, 1:40 pm

How to help North Bay Wildfire Victims:

Wildfire relief organizations prefer monetary donations at this time. For safety reasons, and to avoid blocking emergency traffic, please don’t bring donations to areas affected by wildfires.

Places to donate in Contra Costa:

The Bay Area Air Quality Management District has declared a health advisory due to heavy smoke from the North Bay Fires. For more information visit http://www.baaqmd.gov/

RMP - Antioch Water Treatment Plant


The City provides potable water to the Antioch Water Treatment Plant's (WTP) service area, which coincides with the City limits. The facility is capable of treating 26 million gallons per day (mgd) of water; however, it currently averages 15 mgd. Chlorine is used to disinfect the water. Anhydrous Ammonia is introduced into the treatment process prior to the point of disinfection.

For additional information regarding this facility's operations and most recent audit results, please view the Audit Summary English | Spanish.


Regulated Substances Subject to CalARP/Federal RMP/ISO:
Regulated Substance Program Level CalARP Regulated Federal RMP Regulated ISO Regulated
Chlorine 3 yes yes no
Anhydrous Ammonia 2 yes no no