GOLDEN STATE WATER COMPANY - SIMI VALLEY Water Quality Report
Serving roughly 45,128 people in Ventura County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for GOLDEN STATE WATER COMPANY - SIMI VALLEY
1 water provider directly on file, serving roughly 45,128 people in Ventura County, California.
Quick answer: GOLDEN STATE WATER COMPANY - SIMI VALLEY has no violations on file. One reading is worth knowing about: Nitrate was measured at 15MG/L, among the highest of the 179 providers on file in this area. It's the most notable figure in this system's record among its 179 local peers.
Lead Summary
Lithium
TDS
Sulfate
Nitrate
Chromium, Hex
Tetrachloroethylene
Perchlorate
Selenium
Conductivity (at 25°C)
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dibromoaceticacid
Monobromoaceticacid
Dichloroaceticacid
Utility GOLDEN STATE WATER COMPANY - SIMI VALLEYPopulation served 45,128Owner 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: 4 UG/L (ppb)
1/21/2025
Selenium
Detected: 62 UG/L (ppb)
10/7/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 2.9 UG/L (ppb)
8/8/2025
TTHM
Detected: 14 UG/L (ppb)
8/8/2025
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: 0.75 UG/L (ppb)
8/8/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 5.8 UG/L (ppb)
8/8/2025
Bromodichloromethane
Detected: 2.4 UG/L (ppb)
8/8/2025
Dibromochloromethane
Detected: 5.1 UG/L (ppb)
8/8/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 910 MG/L (ppm)
10/7/2025
Nitrate
Detected: 15 MG/L (ppm)
10/7/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 20.7 µg/L (ppb)
12/17/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Tetrachloroethylene
Detected: 1 UG/L (ppb)
10/7/2025
Other
Additional substances tested that don't fit neatly into the categories above
TDS
Detected: 690 MG/L (ppm)
10/28/2025
Perchlorate
Detected: 4.2 UG/L (ppb)
10/7/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Conductivity (at 25°C)
Detected: 2400 UMHO/CM
10/7/2025
Dibromoaceticacid
Detected: 2.9 UG/L (ppb)
8/8/2025
Monobromoaceticacid
Detected: 1 UG/L (ppb)
2/11/2025
Dichloroaceticacid
Detected: 1.5 UG/L (ppb)
8/8/2025
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.