Serving roughly 25,329 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for CITY OF SOUTH PASADENA
1 water provider directly on file, serving roughly 25,329 people in Los Angeles County, California.
Quick answer: CITY OF SOUTH PASADENA has no violations on file. One reading is worth knowing about: Nitrate was measured at 9MG/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
Nitrate
TTHM
Carbontetrachloride
Tetrachloroethylene
Carbondioxide
Perchlorate
Bromoform
1, 2, 3-Trichloropropane
Fluoride
Trichloroethylene
Utility CITY OF SOUTH PASADENAPopulation served 25,329Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 0.58 UG/L (ppb)
3/4/2025
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: 1.2 UG/L (ppb)
4/21/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 9 MG/L (ppm)
10/7/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Fluoride
Detected: 1.1 MG/L (ppm)
8/12/2025
Often added deliberately for dental health; can also occur naturally.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Carbontetrachloride
Detected: 0.59 UG/L (ppb)
10/7/2025
Tetrachloroethylene
Detected: 16 UG/L (ppb)
10/7/2025
1, 2, 3-Trichloropropane
Detected: 0.021 UG/L (ppb)
10/28/2025
Trichloroethylene
Detected: 0.91 UG/L (ppb)
10/7/2025
Other
Additional substances tested that don't fit neatly into the categories above
Carbondioxide
Detected: 3700 UG/L (ppb)
6/24/2025
Perchlorate
Detected: 4 UG/L (ppb)
10/7/2025
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.