GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM Water Quality Report
Serving roughly 4,644 people in Lake County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM
1 water provider directly on file, serving roughly 4,644 people in Lake County, California.
Quick answer: GOLDEN STATE WATER CO.-CLEARLAKE SYSTEM has no violations on file. One reading is worth knowing about: Carbon, Total was measured at 5.6MG/L, among the highest of the 291 providers on file in this area. It's the most notable figure in this system's record among its 291 local peers.
Lead Summary
Lithium
Magnesium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Hardness, Total (ASCACO3)
Carbon, Total
TDS
Sulfate
Chloride
Turbidity
Manganese
Copper, Free
Zinc
Conductivity (at 25°C)
Color
Totalhaloaceticacids (HAA5)
TTHM
Lead
Chloroform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Monochloroaceticacid
Potassium
Sodium
Fluoride
Nitrate
pH
Iron
Nickel
Arsenic
Aluminum
Combined Uranium
Utility GOLDEN STATE WATER CO.-CLEARLAKE SYSTEMPopulation served 4,644Owner Private
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0041 mg/L (ppm)
12/31/2026
Manganese
Detected: 16 UG/L (ppb)
10/22/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Copper, Free
Detected: 300 UG/L (ppb)
9/24/2025
Zinc
Detected: 270 UG/L (ppb)
2/19/2025
Lead
Detected: 7.8 UG/L (ppb)
9/24/2025
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.
Iron
Detected: 200 UG/L (ppb)
2/19/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Nickel
Detected: 2.1 UG/L (ppb)
2/19/2025
Arsenic
Detected: 1.2 UG/L (ppb)
2/19/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Aluminum
Detected: 99 UG/L (ppb)
2/19/2025
Combined Uranium
Detected: 1.2 PCI/L
7/30/2025
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
Totalhaloaceticacids (HAA5)
Detected: 19 UG/L (ppb)
10/22/2025
TTHM
Detected: 16 UG/L (ppb)
10/22/2025
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: 9.6 UG/L (ppb)
10/22/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 4.3 UG/L (ppb)
10/22/2025
Dibromochloromethane
Detected: 2.2 UG/L (ppb)
10/22/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 7.8 MG/L (ppm)
2/19/2025
Chloride
Detected: 13 MG/L (ppm)
2/19/2025
Fluoride
Detected: 0.13 MG/L (ppm)
2/19/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.069 MG/L (ppm)
10/23/2025
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: 19 MG/L (ppm)
2/19/2025
Calcium
Detected: 27 MG/L (ppm)
2/19/2025
Potassium
Detected: 2.4 MG/L (ppm)
2/19/2025
Sodium
Detected: 14 MG/L (ppm)
2/19/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 150 MG/L (ppm)
2/19/2025
pH
Detected: 8 PH
2/19/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 25.5 µg/L (ppb)
12/6/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 150 MG/L (ppm)
10/23/2025
Alkalinity, Carbonate
Detected: 4.2 MG/L (ppm)
10/23/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 160 MG/L (ppm)
10/23/2025
Carbon, Total
Detected: 5.6 MG/L (ppm)
10/23/2025
TDS
Detected: 190 MG/L (ppm)
2/19/2025
Turbidity
Detected: 0.15 NTU
2/19/2025
A measure of water cloudiness from suspended particles.
Conductivity (at 25°C)
Detected: 350 UMHO/CM
2/19/2025
Color
Detected: 2 UNITS
10/22/2025
Dichloroaceticacid
Detected: 12 UG/L (ppb)
10/22/2025
Trichloroaceticacid
Detected: 5.2 UG/L (ppb)
10/22/2025
Dibromoaceticacid
Detected: 1.8 UG/L (ppb)
10/22/2025
Monochloroaceticacid
Detected: 3.6 UG/L (ppb)
7/2/2025
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.