CAL-WATER SERVICE CO.-WILLOWS Water Quality Report
Serving roughly 7,240 people in Glenn County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for CAL-WATER SERVICE CO.-WILLOWS
1 water provider directly on file, serving roughly 7,240 people in Glenn County, California.
Quick answer: CAL-WATER SERVICE CO.-WILLOWS has no violations on file. One reading is worth knowing about: Gross Alpha Particle Activity was measured at 3.55PCI/L, among the highest of the 107 providers on file in this area. It's the most notable figure in this system's record among its 107 local peers.
Lead Summary
Lithium
TTHM
Dibromochloromethane
Perfluoroctanoicacid (PFOA)
pH, Field
Chromium, Hex
Vanadium, Total
Chromium
Arsenic
Selenium
Copper, Free
Zinc
Chloride
Fluoride
Nitrate
Sulfate
Adsorbableorganicfluorine
Perfluorohexanesulfonicacid (PFHxS)
Perfluorononanoicacid (PFNA)
Perfluoroctanesulfonicacid (PFOS)
Combined Uranium
Gross Alpha Particle Activity
Utility CAL-WATER SERVICE CO.-WILLOWSPopulation served 7,240Owner 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)
12/31/2023
Chromium, Hex
Detected: 2.7 UG/L (ppb)
10/23/2025
Vanadium, Total
Detected: 12.7 UG/L (ppb)
9/10/2025
Chromium
Detected: 8.3 UG/L (ppb)
9/10/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Arsenic
Detected: 3.3 UG/L (ppb)
9/10/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Selenium
Detected: 1.1 UG/L (ppb)
9/10/2025
Copper, Free
Detected: 6.9 UG/L (ppb)
9/10/2025
Zinc
Detected: 8.4 UG/L (ppb)
9/10/2025
Combined Uranium
Detected: 0.74 PCI/L
1/27/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 0.57 UG/L (ppb)
8/25/2025
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.
Dibromochloromethane
Detected: 0.57 UG/L (ppb)
8/25/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 9.6 MG/L (ppm)
6/24/2025
Fluoride
Detected: 0.3 MG/L (ppm)
7/7/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 3.2 MG/L (ppm)
7/7/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Sulfate
Detected: 14 MG/L (ppm)
4/23/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
pH, Field
Detected: 7.8 PH
10/27/2025
Gross Alpha Particle Activity
Detected: 3.55 PCI/L
1/27/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 16 µg/L (ppb)
6/12/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Other
Additional substances tested that don't fit neatly into the categories above
Perfluoroctanoicacid (PFOA)
Detected: 2 NG/L (ppt)
10/27/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Adsorbableorganicfluorine
Detected: 3500 NG/L (ppt)
4/8/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 2.4 NG/L (ppt)
10/27/2025
Perfluorononanoicacid (PFNA)
Detected: 2 NG/L (ppt)
7/7/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 3.8 NG/L (ppt)
10/27/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
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.