Serving roughly 8,243 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for LA PUENTE VALLEY CWD
1 water provider directly on file, serving roughly 8,243 people in Los Angeles County, California.
Quick answer: LA PUENTE VALLEY CWD has no violations on file. One reading is worth knowing about: Copper Summary was measured at 5.6mg/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
Copper Summary
Aggressive Index
Temperature (CENTIGRADE)
Langelier Index (pH(s))
Langelier Index (Source Temp.)
Calcium
Magnesium
Hardness, Total (ASCACO3)
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Chloride
Sulfate
Nitrate
pH
pH, Field
Potassium
Fluoride
N-Nitrosodimethylamine
1, 4-Dioxane
Dichlorodifluoromethane
1, 2-Dichloroethane
Carbontetrachloride
Tetrachloroethylene
Trichloroethylene
Perchlorate
Barium
Utility LA PUENTE VALLEY CWDPopulation served 8,243Owner 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)
12/31/2026
Copper Summary
Detected: 5.6 mg/L (ppm)
12/31/2004
Barium
Detected: 120 UG/L (ppb)
6/4/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 41 MG/L (ppm)
9/2/2025
Sulfate
Detected: 41 MG/L (ppm)
9/9/2025
Nitrate
Detected: 9.5 MG/L (ppm)
9/9/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Fluoride
Detected: 0.38 MG/L (ppm)
6/4/2025
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Calcium
Detected: 62.9 MG/L (ppm)
9/4/2025
Magnesium
Detected: 16.2 MG/L (ppm)
9/2/2025
Potassium
Detected: 2.2 MG/L (ppm)
5/14/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 1.1 LANG
6/25/2025
Hardness, Total (ASCACO3)
Detected: 239 MG/L (ppm)
9/2/2025
pH
Detected: 8.19 PH
9/29/2025
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: 7.54 PH
9/9/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Dichlorodifluoromethane
Detected: 0.87 UG/L (ppb)
9/3/2025
1, 2-Dichloroethane
Detected: 0.51 UG/L (ppb)
1/6/2025
Carbontetrachloride
Detected: 1 UG/L (ppb)
9/3/2025
Tetrachloroethylene
Detected: 1.2 UG/L (ppb)
9/3/2025
Trichloroethylene
Detected: 2.9 UG/L (ppb)
9/9/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 210 MG/L (ppm)
9/2/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.5 AGGR
6/25/2025
Temperature (CENTIGRADE)
Detected: 23.8 C
9/9/2025
Langelier Index (Source Temp.)
Detected: 0.6 LANG
6/25/2025
Alkalinity, Total
Detected: 170 MG/L (ppm)
9/2/2025
TDS
Detected: 320 MG/L (ppm)
9/4/2025
N-Nitrosodimethylamine
Detected: 0.0023 UG/L (ppb)
9/9/2025
1, 4-Dioxane
Detected: 0.36 UG/L (ppb)
9/3/2025
Perchlorate
Detected: 14 UG/L (ppb)
9/3/2025
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.