SAN GABRIEL VALLEY WATER CO.-EL MONTE Water Quality Report
Serving roughly 248,000 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for SAN GABRIEL VALLEY WATER CO.-EL MONTE
1 water provider directly on file, serving roughly 248,000 people in Los Angeles County, California.
Quick answer: SAN GABRIEL VALLEY WATER CO.-EL MONTE has no violations on file. One reading is worth knowing about: Perfluoropentanesulfonicacid (PFPES) was measured at 8.4NG/L, among the highest of the 601 providers on file in this area. It's the most notable figure in this system's record among its 601 local peers.
Lead Summary
PFBA
PFPEA
TDS
Alkalinity, Total
Alkalinity, Bicarbonate
Carbon, Total
Chloride
Sulfate
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Perfluoropentanesulfonicacid (PFPES)
1, 4-Dioxane
Perchlorate
Fluoride
Magnesium
Calcium
Hardness, Total (ASCACO3)
Gross Alpha Particle Activity
Combined Uranium
Iron
Molybdenum, Total
Trichloroethylene
Tetrachloroethylene
Utility SAN GABRIEL VALLEY WATER CO.-EL MONTEPopulation served 248,000Owner 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
Combined Uranium
Detected: 1.1 PCI/L
9/24/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Iron
Detected: 33 UG/L (ppb)
1/14/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Molybdenum, Total
Detected: 4.4 UG/L (ppb)
9/2/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 17 MG/L (ppm)
9/17/2025
Sulfate
Detected: 25 MG/L (ppm)
9/17/2025
Nitrate
Detected: 3.6 MG/L (ppm)
9/24/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Fluoride
Detected: 0.48 MG/L (ppm)
9/24/2025
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 19.4 MG/L (ppm)
7/7/2025
Calcium
Detected: 102 MG/L (ppm)
7/7/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 334 MG/L (ppm)
7/7/2025
Gross Alpha Particle Activity
Detected: 5.63 PCI/L
9/24/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFBA
Detected: 0.01 µg/L (ppb)
2/28/2025
PFPEA
Detected: 0.0056 µg/L (ppb)
2/28/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Trichloroethylene
Detected: 0.73 UG/L (ppb)
9/24/2025
Tetrachloroethylene
Detected: 110 UG/L (ppb)
4/1/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 240 MG/L (ppm)
9/17/2025
Other
Additional substances tested that don't fit neatly into the categories above
TDS
Detected: 280 MG/L (ppm)
9/24/2025
Alkalinity, Total
Detected: 200 MG/L (ppm)
9/17/2025
Carbon, Total
Detected: 0.33 MG/L (ppm)
9/17/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 11 NG/L (ppt)
8/25/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 2.9 NG/L (ppt)
8/25/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 4.2 NG/L (ppt)
9/24/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 10 NG/L (ppt)
9/24/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 4.8 NG/L (ppt)
9/24/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 12 NG/L (ppt)
8/25/2025
Perfluorobutanoicacid (PFBA)
Detected: 2.2 NG/L (ppt)
9/24/2025
Perfluoropentanoicacid (PFPEA)
Detected: 8.2 NG/L (ppt)
8/25/2025
Perfluoropentanesulfonicacid (PFPES)
Detected: 8.4 NG/L (ppt)
8/25/2025
1, 4-Dioxane
Detected: 0.62 UG/L (ppb)
9/2/2025
Perchlorate
Detected: 1.3 UG/L (ppb)
5/22/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
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.