
Modesto, California | Municipal Water Utility Company | Public Service Announcement
The residential tap water in City of Modesto may contain various contaminants including Dibromoacetic acid and Beryllium, alongside concerning levels of water hardness. City of Modesto provides the local area with municipal water sourced primarily from purchased surface water supplies.
What's in your tap water?
Limited Time: Free Official Water Safety Report for City of Modesto!
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City of Modesto Area Details

Area served:
Modesto, California

Population served:
212658

Water source:
Purchased surface water

Phone:
209-577-5200

Address:
1010 10th Street, Modesto, CA 95354

3date
Contaminants Detected In Modesto, California
1,2,3-Trichloropropane; 1,2-Dibromo-3-chloropropane (DBCP); Arsenic; Bromodichloromethane; Chloroform; Chromium (hexavalent); Dibromochloromethane; Di… more

Limited Time: Free Official Water Safety Report for City of Modesto!
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City of Modesto
Annual Municipal Water Report
List of Municipal Water Contaminants Tested by City of Modesto
Tested But Not Detected:
1,1,1,2-Tetrachloroethane; 1,1,1-Trichloroethane; 1,1,2,2-Tetrachloroethane; 1,1,2-Trichloroethane; 1,1-Dichloropropene; 1,2,3-Trichlorobenzene; 1,2,4-Trichlorobenzene; 1,2,4-Trimethylbenzene; 1,2-Dichloroethane; 1,2-Dichloropropane; 1,3,5-Trimethylbenzene; 1,3-Butadiene; 1,3-Dichloropropane; 1,3-Dichloropropene; 1,3-Dinitrobenzene; 17-beta-Estradiol; 2,2-Dichloropropane; 2,3,7,8-TCDD (Dioxin); 2,4,5-T; 2,4,5-TP (Silvex); 2,4-D; 3-Hydroxycarbofuran; 4-Androstene-3,17-dione; Acetone; Alachlor (Lasso); Aldicarb; Aldicarb sulfone; Aldicarb sulfoxide; Aldrin; Antimony; Asbestos; Atrazine; Bentazon (Basagran); Benzene; Benzo[a]pyrene; Beryllium; Bromacil; Bromobenzene; Bromochloromethane; Bromomethane; Butachlor; Cadmium; Carbaryl; Carbofuran; Carbon tetrachloride; Chlordane; Chloroethane; Chloromethane; Chlorothalonil (Bravo); cis-1,2-Dichloroethylene; cis-1,3-Dichloropropene; Cobalt; Cyanide; Dalapon; Di(2-ethylhexyl) adipate; Di(2-ethylhexyl) phthalate; Diazinon (Spectracide); Dibromomethane; Dicamba; Dichloromethane (methylene chloride); Dieldrin; Dimethoate; Dinoseb; Diquat; Diuron; Endothall; Endrin; Equilin; Estriol; Estrone; Ethinyl estradiol; Ethyl tert-butyl ether; Ethylbenzene; Ethylene dibromide; Glyphosate; Heptachlor; Heptachlor epoxide; Hexachlorobenzene (HCB); Hexachlorobutadiene; Hexachlorocyclopentadiene; Isopropyl ether; Isopropylbenzene; Lindane; m- & p-Xylene; m-Dichlorobenzene; Mercury (inorganic); Methomyl; Methoxychlor; Methyl ethyl ketone; Methyl isobutyl ketone; Metolachlor; Metribuzin; Molinate; Monobromoacetic acid; Monochlorobenzene (chlorobenzene); MTBE; n-Butylbenzene; n-Propylbenzene; Naphthalene; o-Chlorotoluene; o-Dichlorobenzene; o-Xylene; Oxamyl (Vydate); p-Chlorotoluene; p-Dichlorobenzene; p-Isopropyltoluene; Pentachlorophenol; Perchlorate; Perfluorobutane sulfonate (PFBS); Perfluoroheptanoic acid (PFHPA); Perfluorohexane sulfonate (PFHXS); Perfluorononanoic acid (PFNA); Perfluorooctane sulfonate (PFOS); Perfluorooctanoic acid (PFOA); Picloram; Polychlorinated biphenyls (PCBs); Propachlor; sec-Butylbenzene; Silver; Simazine; Styrene; tert-Amyl methyl ether; tert-Butyl alcohol; tert-Butylbenzene; Testosterone; Thallium; Thiobencarb; Toluene; Toxaphene; trans-1,2-Dichloroethylene; trans-1,3-Dichloropropene; Trichlorofluoromethane; Trifluralin; Vinyl chloride; Xylenes (total)

What's in your tap water?

Discover which contaminants exceed Legal and Health Guidelines in your water.
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City of Modesto
About Us
The City currently maintains 79 active wells, 9 storage tanks, and 181 water sampling points throughout the system. Until 1995, Modesto residents received their water exclusively from groundwater wells. To ensure continued delivery of clean, reliable water, the City formed a partnership with the Modesto Irrigation District (MID) to build a surface water treatment facility at Modesto Reservoir.
This treatment facility produces water that meets all state and federal quality standards. In 2017, approximately 43% of water supplied came from groundwater wells, while 57% was treated surface water.
Surface Water Treatment Process:
- Water flows from Modesto Reservoir into the treatment plant where ozone disinfection occurs
- Liquid alum and polymers are rapidly mixed with the water to create floc, which captures suspended particles
- Water moves through sedimentation basins allowing floc to settle before filtration
- Anthracite filters remove any remaining floc particles
- Chlorine is added as the final disinfectant
- Lime and carbon dioxide are introduced to prevent pipe corrosion
- Treated water flows to Modesto and into two 5-million-gallon storage tanks
- Water is distributed through the system as needed, blending with groundwater before reaching homes

For more information on your municipal water, visit the U.S. Environmental Protection Agency:
City of Modesto Municipal Water Company and EPACity of Modesto Municipal Water Report Information
The EPA provides valuable resources regarding water quality standards, testing protocols, and health guidelines for municipal water systems. Regular monitoring ensures that Modesto's water supply meets federal regulations designed to protect public health.
Residents can access detailed information about local water quality reports, contamination risks, and treatment methods through the EPA's comprehensive database.
Municipal Water Utility Company FAQ

For more information on your municipal water, visit the U.S. CDC:
City of Modesto Municipal Water Company and CDC- How often is Modesto's municipal water tested?
- What causes water hardness in the Modesto area?
- Are there filtration systems recommended for Modesto residents?
- How does the city address seasonal water quality changes?
- What steps should residents take if they notice discoloration in their water?

City of Modesto provides municipal water services to the public of Modesto and Modesto, California.
Get the City of Modesto Official Water Score Report for Free (limited time offer).

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