CUCAMONGA VALLEY WATER DISTRICT Water Quality Report
Serving roughly 211,069 people in San Bernardino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CUCAMONGA VALLEY WATER DISTRICT
1 water provider directly on file, serving roughly 211,069 people in San Bernardino County, California.
Quick answer: CUCAMONGA VALLEY WATER DISTRICT has no violations on file. One reading is worth knowing about: pH was measured at 8.4PH, 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
Magnesium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Hardness, Total (ASCACO3)
Chloride
Sulfate
Fluoride
Nitrate
Turbidity
Combined Uranium
pH
Odor
Barium
Conductivity (at 25°C)
Temperature (CENTIGRADE)
pH, Field
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Color
Utility CUCAMONGA VALLEY WATER DISTRICTPopulation served 211,069Owner Local government
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)
12/31/2024
Combined Uranium
Detected: 3.7 PCI/L
1/16/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Barium
Detected: 32 UG/L (ppb)
6/19/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 4.7 UG/L (ppb)
7/2/2025
TTHM
Detected: 51 UG/L (ppb)
7/2/2025
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)
7/2/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 14 UG/L (ppb)
7/2/2025
Bromodichloromethane
Detected: 11 UG/L (ppb)
7/2/2025
Dibromochloromethane
Detected: 16 UG/L (ppb)
7/2/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 2.2 MG/L (ppm)
6/19/2025
Sulfate
Detected: 17 MG/L (ppm)
6/19/2025
Fluoride
Detected: 0.56 MG/L (ppm)
6/19/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.072 MG/L (ppm)
1/16/2025
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: 9.4 MG/L (ppm)
6/19/2025
Sodium
Detected: 11 MG/L (ppm)
6/19/2025
Calcium
Detected: 49 MG/L (ppm)
6/19/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 160 MG/L (ppm)
6/19/2025
pH
Detected: 8.4 PH
6/19/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
pH, Field
Detected: 8.64 PH
8/4/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 150 MG/L (ppm)
6/19/2025
Alkalinity, Carbonate
Detected: 6.3 MG/L (ppm)
6/19/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 160 MG/L (ppm)
6/19/2025
Turbidity
Detected: 0.15 NTU
8/11/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 1 TON
7/21/2025
Conductivity (at 25°C)
Detected: 350 UMHO/CM
6/19/2025
Temperature (CENTIGRADE)
Detected: 24.7 C
8/11/2025
Dichloroaceticacid
Detected: 1 UG/L (ppb)
7/2/2025
Trichloroaceticacid
Detected: 1.5 UG/L (ppb)
4/3/2025
Dibromoaceticacid
Detected: 4.7 UG/L (ppb)
7/2/2025
Color
Detected: 2 UNITS
4/7/2025
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.