CAL-WATER SERVICE CO.-MARYSVILLE Water Quality Report
Serving roughly 12,419 people in Yuba County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for CAL-WATER SERVICE CO.-MARYSVILLE
1 water provider directly on file, serving roughly 12,419 people in Yuba County, California.
Quick answer: CAL-WATER SERVICE CO.-MARYSVILLE has no violations on file. One reading is worth knowing about: Magnesium was measured at 42MG/L, among the highest of the 120 providers on file in this area. It's the most notable figure in this system's record among its 120 local peers.
Lead Summary
TTHM
Lead
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Copper, Free
Magnesium
Potassium
Sodium
Calcium
Perfluoroctanesulfonicacid (PFOS)
Perfluorobutanoicacid (PFBA)
Combined Uranium
Vanadium, Total
Manganese
Iron
Boron, Total
Acetone
Nickel
Chromium
Utility CAL-WATER SERVICE CO.-MARYSVILLEPopulation served 12,419Owner Private
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Lead
Detected: 1.1 UG/L (ppb)
6/20/2025
A metal that can leach from old pipes, solder, and fixtures. Current medical guidance holds there is no truly safe level of lead exposure, especially for children and pregnant women.
Copper, Free
Detected: 12.4 UG/L (ppb)
7/3/2025
Combined Uranium
Detected: 4.7 PCI/L
9/24/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Vanadium, Total
Detected: 11 UG/L (ppb)
8/21/2025
Manganese
Detected: 1.7 UG/L (ppb)
9/16/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Iron
Detected: 31 UG/L (ppb)
2/26/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Nickel
Detected: 1.4 UG/L (ppb)
9/16/2025
Chromium
Detected: 3.5 UG/L (ppb)
9/16/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 6.6 UG/L (ppb)
6/16/2025
A group of disinfection byproducts formed when chlorine reacts with organic matter. Long-term exposure above the legal limit has been linked to increased cancer risk in some studies.
Chloroform
Detected: 1.1 UG/L (ppb)
6/16/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 1.4 UG/L (ppb)
6/16/2025
Bromodichloromethane
Detected: 1.7 UG/L (ppb)
6/16/2025
Dibromochloromethane
Detected: 2.4 UG/L (ppb)
6/16/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Boron, Total
Detected: 55 UG/L (ppb)
5/20/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 42 MG/L (ppm)
9/24/2025
Potassium
Detected: 2.2 MG/L (ppm)
9/24/2025
Sodium
Detected: 32 MG/L (ppm)
9/24/2025
Calcium
Detected: 62 MG/L (ppm)
9/24/2025
Other
Additional substances tested that don't fit neatly into the categories above
Perfluoroctanesulfonicacid (PFOS)
Detected: 2.1 NG/L (ppt)
10/22/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 6.2 NG/L (ppt)
10/20/2025
Acetone
Detected: 14 UG/L (ppb)
4/28/2025
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.