GOLDEN STATE WATER CO - BARSTOW Water Quality Report
Serving roughly 32,547 people in San Bernardino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for GOLDEN STATE WATER CO - BARSTOW
1 water provider directly on file, serving roughly 32,547 people in San Bernardino County, California.
Quick answer: GOLDEN STATE WATER CO - BARSTOW has no violations on file. One reading is worth knowing about: Adsorbableorganicfluorine was measured at 2700NG/L, among the highest of the 669 providers on file in this area. It's the most notable figure in this system's record among its 669 local peers.
Lead Summary
Lithium
PFHXS
PFPEA
PFOA
PFHXA
Totalhaloaceticacids (HAA5)
TTHM
Lead
Bromoform
Bromodichloromethane
Dibromochloromethane
Chloroform
Dichloroaceticacid
Dibromoaceticacid
Copper, Free
Nitrate
Aggressive Index
Langelier Index (pH(s))
Langelier Index (Source Temp.)
Magnesium
Potassium
Sodium
Calcium
Hardness, Total (ASCACO3)
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Sulfate
Chloride
Fluoride
Nitrate-Nitrite
Adsorbableorganicfluorine
Perfluorohexanesulfonicacid (PFHxS)
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Utility GOLDEN STATE WATER CO - BARSTOWPopulation served 32,547Owner Private
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0016 mg/L (ppm)
12/31/2025
Lead
Detected: 1.1 UG/L (ppb)
7/24/2025
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.
Copper, Free
Detected: 100 UG/L (ppb)
8/27/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 3.3 UG/L (ppb)
5/19/2025
TTHM
Detected: 5.5 UG/L (ppb)
5/19/2025
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.
Bromoform
Detected: 2 UG/L (ppb)
5/19/2025
Bromodichloromethane
Detected: 1.2 UG/L (ppb)
5/19/2025
Dibromochloromethane
Detected: 2.3 UG/L (ppb)
5/19/2025
Chloroform
Detected: 1.7 UG/L (ppb)
5/19/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 4.8 MG/L (ppm)
8/18/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Sulfate
Detected: 100 MG/L (ppm)
4/28/2025
Chloride
Detected: 76 MG/L (ppm)
4/28/2025
Fluoride
Detected: 0.34 MG/L (ppm)
4/28/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 5 MG/L (ppm)
4/28/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 12 MG/L (ppm)
4/28/2025
Potassium
Detected: 3 MG/L (ppm)
4/28/2025
Sodium
Detected: 70 MG/L (ppm)
4/28/2025
Calcium
Detected: 71 MG/L (ppm)
4/28/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.54 LANG
4/28/2025
Hardness, Total (ASCACO3)
Detected: 230 MG/L (ppm)
4/28/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 21.9 µg/L (ppb)
9/21/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHXS
Detected: 0.0044 µg/L (ppb)
9/27/2023
PFPEA
Detected: 0.0049 µg/L (ppb)
9/27/2023
PFOA
Detected: 0.0057 µg/L (ppb)
9/27/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXA
Detected: 0.0054 µg/L (ppb)
9/27/2023
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 180 MG/L (ppm)
4/28/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 1.4 UG/L (ppb)
5/19/2025
Dibromoaceticacid
Detected: 1.9 UG/L (ppb)
5/19/2025
Aggressive Index
Detected: 11.78 AGGR
4/28/2025
Langelier Index (Source Temp.)
Detected: -0.06 LANG
4/28/2025
Alkalinity, Total
Detected: 150 MG/L (ppm)
4/28/2025
TDS
Detected: 500 MG/L (ppm)
4/28/2025
Adsorbableorganicfluorine
Detected: 2700 NG/L (ppt)
4/15/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 4.7 NG/L (ppt)
7/17/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 2.8 NG/L (ppt)
7/17/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 2.2 NG/L (ppt)
7/17/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 3.8 NG/L (ppt)
7/17/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 5.2 NG/L (ppt)
7/17/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 4.1 NG/L (ppt)
7/17/2025
Perfluorobutanoicacid (PFBA)
Detected: 3.1 NG/L (ppt)
7/17/2025
Perfluoropentanoicacid (PFPEA)
Detected: 3.4 NG/L (ppt)
7/17/2025
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.