The Power of Information

National Drinking Water Database


Dichlorodifluoromethane in California


Dichlorodifluoromethane (Freon 12) is a chlorofluorocarbon refrigerant and aerosol spray propellant; it was banned under the Montreal Protocol as of 2000 because of its ozone-depleting properties.

The Most Polluted Communities in California

42 water utilities reported detecting Dichlorodifluoromethane in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Dichlorodifluoromethane level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1San Joaquin County - Wilkinson Manor
Stockton, CA
6704 of 618.43 ppb
(0 to 42.4 ppb)
2Tokay Park Water Co
Sacramento, CA
5251 of 112 ppb
(12 ppb)
3San Bernardino City
San Bernardin0, CA
175,000192 of 2102.19 ppb
(0 to 8.4 ppb)
4Sacramento Suburban Water District
Sacramento, CA
170,0007 of 381.99 ppb
(0 to 24 ppb)
5California Water Service - Livermore
Livermore, CA
53,54089 of 1141.99 ppb
(0 to 17.34 ppb)
6LA Puente Valley Cwd
La Puente, CA
7,50045 of 461.66 ppb
(0 to 10 ppb)
7Northern Calif Youth Corr. Center
Stockton, CA
4,83424 of 261.35 ppb
(0 to 2.03 ppb)
8Cws - North Garden
Bakersfield, CA
16,7699 of 510.87 ppb
(0 to 14.09 ppb)
9Md#85 Valeta Mutual Water Company
Chowchilla, CA
451 of 10.77 ppb
(0.77 ppb)
10San Gabriel Valley WC - Fontana
Fontana, CA
102,599263 of 3200.64 ppb
(0 to 5.55 ppb)

Health Based Limits for Dichlorodifluoromethane

StandardDescriptionLevel
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.1000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.5000 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.40000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.40000 ppb

Violation Summary for Dichlorodifluoromethane in California

There are no violations reported for this contaminant in California