
South San Francisco, California | Municipal Water Utility Company | Public Service Announcement
The municipal water distributed by California Water Service in South San Francisco may contain several concerning contaminants including Hexachlorobenzene (HCB) and Pentachlorophenol, alongside elevated levels of water hardness. This utility supplies the area with municipal water sourced primarily from purchased surface water supplies that serve local residents throughout the county.
What's in your tap water?
For a Limited Time - Get the California Water Service - South San Francisco Official Water Score Report for Free.
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California Water Service - South San Francisco Area Details

Area served:
South San Francisco, California

Population served:
56382

Water source:
Purchased surface water

Phone:
650-558-7800

Address:
341 North Delaware Street, San Mateo, CA 94401

3date
Contaminants Detected In South San Francisco, California
1,2,3-Trichloropropane; Arsenic; Bromodichloromethane; Chloroform; Chromium (hexavalent); Dichloroacetic acid; Manganese; Total trihalomethanes (TTHMs… more

For a Limited Time - Get the California Water Service - South San Francisco Official Water Score Report for Free.
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California Water Service - South San Francisco
Annual Municipal Water Report
List of Municipal Water Contaminants Tested by California Water Service - South San Francisco
Tested But Not Detected:
1,1,1,2-Tetrachloroethane; 1,1,1-Trichloroethane; 1,1,2,2-Tetrachloroethane; 1,1,2-Trichloroethane; 1,1-Dichloroethane; 1,1-Dichloroethylene; 1,1-Dichloropropene; 1,2,3-Trichlorobenzene; 1,2,4-Trichlorobenzene; 1,2,4-Trimethylbenzene; 1,2-Dibromo-3-chloropropane (DBCP); 1,2-Dichloroethane; 1,3,5-Trimethylbenzene; 1,3-Butadiene; 1,3-Dichloropropane; 1,3-Dichloropropene; 1,4-Dioxane; 17-beta-Estradiol; 2,2-Dichloropropane; 2,3,7,8-TCDD (Dioxin); 2,4,5-T; 2,4,5-TP (Silvex); 2,4,6-Trichlorophenol; 2,4-D; 2,4-Dichlorophenol; 2,4-Dimethylphenol; 2,4-Dinitrophenol; 2,4-Dinitrotoluene; 2,6-Dinitrotoluene; 2-Chloroethylvinyl ether; 2-Chloronaphthalene; 2-Chlorophenol; 2-Methyl-4,6-dinitrophenol; 2-Nitrophenol; 3,3-Dichlorobenzidine; 3-Hydroxycarbofuran; 4-Androstene-3,17-dione; 4-Bromophenyl phenyl ether; 4-Chloro-phenyl-phenyl ether; 4-Nitrophenol; Acenaphthene; Acenaphthylene; Acetone; Alachlor (Lasso); Aldicarb; Aldicarb sulfone; Aldicarb sulfoxide; Aldrin; Anthracene; Asbestos; Atrazine; Barban; Baygon (Propoxur); Bentazon (Basagran); Benzene; Benzo[a]anthracene; Benzo[a]pyrene; Benzo[b]fluoranthene; Benzo[g,h,i]perylene; Benzo[k]fluoranthene; bis(2-Chloroethoxy) Methane; bis(2-chloroethyl) ether; bis(2-Chloroisopropyl) ether; Bromacil; Bromobenzene; Bromochloromethane; Bromomethane; Butachlor; Butyl benzyl phthalate; Carbaryl; Carbofuran; Carbon tetrachloride; Chlordane; Chlorodifluoromethane; Chloroethane; Chloromethane; Chlorothalonil (Bravo); Chlorpropham; Chrysene; cis-1,2-Dichloroethylene; cis-1,3-Dichloropropene; Cobalt; Cyanide; Dalapon; Di(2-ethylhexyl) adipate; Di(2-ethylhexyl) phthalate; Di-n-butyl phthalate; Di-n-octyl phthalate; Diazinon (Spectracide); Dibenz[a,h]anthracene; Dibromomethane; Dicamba; Dichlorodifluoromethane; Dichloromethane (methylene chloride); Dieldrin; Diethyl phthalate; Dimethoate; Dimethyl phthalate; Dinoseb; Diquat; Diuron; Endothall; Endrin; Equilin; Estriol; Estrone; Ethinyl estradiol; Ethyl tert-butyl ether; Ethylbenzene; Ethylene dibromide; Fenuron; Fluometuron; Fluoranthene; Fluorene; Glyphosate; Heptachlor; Heptachlor epoxide; Hexachlorobenzene (HCB); Hexachlorobutadiene; Hexachlorocyclopentadiene; Hexachloroethane; Hydrogen sulfide; Indeno[1,2,3-cd]pyrene; Isophorone; Isopropyl ether; Isopropylbenzene; Lindane; Linuron; m- & p-Xylene; m-Dichlorobenzene; Mercury (inorganic); Methomyl; Methoxychlor; Methyl ethyl ketone; Methyl isobutyl ketone; Metolachlor; Metribuzin; Molinate; Molybdenum; Monobromoacetic acid; Monochlorobenzene (chlorobenzene); Monuron; n-Butylbenzene; N-Nitrosodi-N-propylamine; N-Nitrosodimethylamine (NDMA); n-Propylbenzene; Naphthalene; Neburon; Nitrite; Nitrobenzene; o-Chlorotoluene; o-Dichlorobenzene; o-Xylene; Oxamyl (Vydate); p-Chlorotoluene; p-Dichlorobenzene; p-Isopropyltoluene; Paraquat; Pentachlorophenol; Perchlorate; Perfluorobutane sulfonate (PFBS); Perfluoroheptanoic acid (PFHPA); Perfluorohexane sulfonate (PFHXS); Perfluorononanoic acid (PFNA); Perfluorooctane sulfonate (PFOS); Perfluorooctanoic acid (PFOA); Phenanthrene; Phenols; Picloram; Polychlorinated biphenyls (PCBs); Propachlor; Propham; Pyrene; Radium; combined (-226 & -228); Radium-226; Radium-228; sec-Butylbenzene; Siduron; Silver; Simazine; Styrene; tert-Amyl methyl ether; tert-Butylbenzene; Testosterone; Tetrachloroethylene (perchloroethylene); Thiobencarb; Toluene; Toxaphene; trans-1,2-Dichloroethylene; trans-1,3-Dichloropropene; Trichloroethylene; Trichlorofluoromethane; Trichlorotrifluoroethane; Trifluralin; Vinyl chloride; Xylenes (total)

What's in your tap water?

Find out which contaminants are found above Legal and Health Guidelines.
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California Water Service - South San Francisco
About Us
Cal Water has provided high-quality water services to South San Francisco residents since 1931. Our water supply comes primarily from the San Francisco Public Utilities Commission (SFPUC), supplemented by five local groundwater wells.
The South San Francisco system infrastructure includes:
- 144 miles of pipeline
- 12 storage tanks
- 1 collection tank
- 21 booster pumps
- Recently upgraded groundwater treatment facility
We continuously maintain and improve our facilities to ensure reliable, quality water delivery. For questions or concerns, please contact our local Customer Center by phone or through our website at www.calwater.com.
CONSERVATION REMAINS ESSENTIAL
As California develops long-term water regulations, conservation must remain a way of life. Using water wisely ensures adequate supply during drought periods and for future generations. Cal Water offers robust conservation programs including rebates, free water-saving kits, and educational resources. Visit www.calwater.com/conservation for details.

For more information on your municipal water, visit the U.S. Environmental Protection Agency:
California Water Service - South San Francisco Drinking Water Company and EPACalifornia Water Service - South San Francisco Municipal Water Report Info
The EPA requires all municipal water providers to regularly test and report on water quality. These reports identify potential contaminants and their health impacts, helping residents make informed decisions about their water consumption.
South San Francisco's water undergoes rigorous testing for over 100 potential contaminants. While most aren't detected, understanding which substances might be present helps residents consider appropriate filtration options for their specific health concerns.
Municipal Water Utility Company FAQ

For more information on your municipal water, visit the U.S. CDC:
California Water Service - South San Francisco Drinking Water Company and CDCWhat are my responsibilities as a customer?
- Provide accurate information when establishing and maintaining your account
- Pay bills by their due dates
- Maintain clear access to water meters at all times
- Avoid parking vehicles, planting trees or shrubs near meters
- Protect your meter from potential damage
How can I pay my bill?
You can pay your bill online via eCheck or using Visa, MasterCard, or Discover Card at www.wcudtn.com. In-person payments are accepted at our office: 4034 Sparta Hwy, McMinnville, TN 37110.
How do I set up online payments?
Visit our website to create a user profile, then select your preferred payment method (eCheck, Visa, MasterCard, or Discover Card).

California Water Service - South San Francisco provides municipal water services to the public of San Mateo and South San Francisco, California.
Free Water Safety Report for California Water Service - South San Francisco. (limited time offer)

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