CAL-WATER SERVICE CO.-OROVILLE Water Quality Report
Serving roughly 11,106 people in Butte County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for CAL-WATER SERVICE CO.-OROVILLE
1 water provider directly on file, serving roughly 11,106 people in Butte County, California.
Quick answer: CAL-WATER SERVICE CO.-OROVILLE has no violations on file. One reading is worth knowing about: Perfluorobutanesulfonicacid (PFBS) was measured at 5.1NG/L, among the highest of the 160 providers on file in this area. It's the most notable figure in this system's record among its 160 local peers.
Lead Summary
Lithium
PFBA
Chloride
Sulfate
Orthophosphate
Fluoride
Nitrate
pH, Field
TTHM
Totalhaloaceticacids (HAA5)
Lead
Chloroform
Bromodichloromethane
Dichloroaceticacid
Trichloroaceticacid
Copper, Free
Aggressive Index
Langelier Index (pH(s))
Alkalinity, Total
Alkalinity, Bicarbonate
Carbon, Total
TDS
Strontium
4-Methyl-2-Pentanone
Conductivity (at 25°C)
Perfluorobutanoicacid (PFBA)
Perfluorobutanesulfonicacid (PFBS)
Perfluorohexanoicacid (PFHXA)
Vanadium, Total
Nickel
Chromium
Arsenic
Magnesium
Utility CAL-WATER SERVICE CO.-OROVILLEPopulation served 11,106Owner Private
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0009 mg/L (ppm)
12/31/2025
Lead
Detected: 1.2 UG/L (ppb)
6/12/2025
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: 1.1 UG/L (ppb)
6/25/2025
Strontium
Detected: 55 UG/L (ppb)
8/13/2025
Vanadium, Total
Detected: 3.1 UG/L (ppb)
6/25/2025
Nickel
Detected: 1.4 UG/L (ppb)
6/25/2025
Chromium
Detected: 1.2 UG/L (ppb)
6/25/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Arsenic
Detected: 1.5 UG/L (ppb)
6/25/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 30 UG/L (ppb)
9/15/2025
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.
Totalhaloaceticacids (HAA5)
Detected: 24 UG/L (ppb)
9/15/2025
Chloroform
Detected: 28 UG/L (ppb)
9/15/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 1.8 UG/L (ppb)
9/15/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 4.1 MG/L (ppm)
9/9/2025
Sulfate
Detected: 1.8 MG/L (ppm)
9/9/2025
Fluoride
Detected: 0.8 MG/L (ppm)
9/9/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 1.8 MG/L (ppm)
2/3/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 18 MG/L (ppm)
4/8/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Orthophosphate
Detected: 0.3 MG/L (ppm)
5/13/2025
pH, Field
Detected: 7.5 PH
10/16/2025
Langelier Index (pH(s))
Detected: -1.3 LANG
8/13/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 81.3 µg/L (ppb)
4/8/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFBA
Detected: 0.0057 µg/L (ppb)
4/21/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 43 MG/L (ppm)
8/13/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 11 UG/L (ppb)
9/15/2025
Trichloroaceticacid
Detected: 13 UG/L (ppb)
9/15/2025
Aggressive Index
Detected: 10.7 AGGR
8/13/2025
Alkalinity, Total
Detected: 43 MG/L (ppm)
8/13/2025
Carbon, Total
Detected: 0.78 MG/L (ppm)
10/16/2025
TDS
Detected: 76 MG/L (ppm)
8/13/2025
4-Methyl-2-Pentanone
Detected: 1.6 UG/L (ppb)
2/3/2025
Conductivity (at 25°C)
Detected: 99 UMHO/CM
8/13/2025
Perfluorobutanoicacid (PFBA)
Detected: 6.3 NG/L (ppt)
4/8/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 5.1 NG/L (ppt)
5/20/2025
Perfluorohexanoicacid (PFHXA)
Detected: 3.1 NG/L (ppt)
5/20/2025
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.