Serving roughly 104,498 people in San Bernardino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for WEST VALLEY WATER DISTRICT
1 water provider directly on file, serving roughly 104,498 people in San Bernardino County, California.
Quick answer: WEST VALLEY WATER DISTRICT has no violation currently counted toward its compliance status. EPA's record shows a Nitrate violation dating to 06/01/1987 (39 years ago) — because it's more than five years past its deadline, EPA's policy no longer treats it as part of this system's current standing, though it remains on the public record.
Lead Summary
Aggressive Index
Langelier Index (pH(s))
Langelier Index (Source Temp.)
Magnesium
Potassium
Sodium
Calcium
Hardness, Total (ASCACO3)
Alkalinity, Total
Alkalinity, Bicarbonate
Foamingagents (SURFACTANTS)
TDS
Sulfate
Chloride
Fluoride
Nitrate
Nitrate-Nitrite
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Turbidity
Radium-228
Combined Uranium
Combined Radium (-226 & -228)
Gross Alpha Particle Activity
pH
Odor
Iron
Vanadium, Total
TTHM
Chromium, Hex
Chloroform
Perchlorate
Arsenic
Methyltert-Butylether
Conductivity (at 25°C)
Utility WEST VALLEY WATER DISTRICTPopulation served 104,498Owner Local government
Older violation on record
Violations on file
Nitrate
Older/archived health-based violation
Found at 1 of 1 provider
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Combined Uranium
Detected: 3.9 PCI/L
7/9/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Iron
Detected: 140 UG/L (ppb)
9/18/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Vanadium, Total
Detected: 3.4 UG/L (ppb)
7/9/2025
Chromium, Hex
Detected: 1.3 UG/L (ppb)
7/9/2025
Arsenic
Detected: 4.3 UG/L (ppb)
9/18/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 1 UG/L (ppb)
7/9/2025
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: 1 UG/L (ppb)
7/9/2025
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
Sulfate
Detected: 18 MG/L (ppm)
9/9/2025
Chloride
Detected: 6.2 MG/L (ppm)
9/9/2025
Fluoride
Detected: 0.34 MG/L (ppm)
9/9/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.5 MG/L (ppm)
10/21/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 4 MG/L (ppm)
7/9/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 7.7 MG/L (ppm)
9/9/2025
Potassium
Detected: 2.4 MG/L (ppm)
9/9/2025
Sodium
Detected: 12 MG/L (ppm)
9/9/2025
Calcium
Detected: 64 MG/L (ppm)
9/9/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 1.25 LANG
9/9/2025
Hardness, Total (ASCACO3)
Detected: 190 MG/L (ppm)
9/9/2025
Gross Alpha Particle Activity
Detected: 3 PCI/L
7/9/2025
pH
Detected: 8 PH
9/9/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 210 MG/L (ppm)
9/9/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.45 AGGR
9/9/2025
Langelier Index (Source Temp.)
Detected: 0.63 LANG
9/9/2025
Alkalinity, Total
Detected: 170 MG/L (ppm)
9/9/2025
Foamingagents (SURFACTANTS)
Detected: 0.14 MG/L (ppm)
7/9/2025
TDS
Detected: 310 MG/L (ppm)
9/9/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 5 NG/L (ppt)
7/9/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 3 NG/L (ppt)
7/9/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 2.6 NG/L (ppt)
7/9/2025
Perfluoroctanoicacid (PFOA)
Detected: 5.1 NG/L (ppt)
7/9/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 5.7 NG/L (ppt)
7/9/2025
Perfluorobutanoicacid (PFBA)
Detected: 3.3 NG/L (ppt)
7/9/2025
Perfluoropentanoicacid (PFPEA)
Detected: 6.4 NG/L (ppt)
7/9/2025
Turbidity
Detected: 0.28 NTU
10/21/2025
A measure of water cloudiness from suspended particles.
Radium-228
Detected: 0.931 PCI/L
9/18/2025
Combined Radium (-226 & -228)
Detected: 0.931 PCI/L
9/18/2025
A naturally occurring radioactive element found in some groundwater.
Odor
Detected: 1 TON
10/21/2025
Perchlorate
Detected: 1.3 UG/L (ppb)
9/9/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Methyltert-Butylether
Detected: 6.3 UG/L (ppb)
9/18/2025
Conductivity (at 25°C)
Detected: 390 UMHO/CM
4/9/2025
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.