Serving roughly 164,344 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for PASADENA WATER AND POWER
1 water provider directly on file, serving roughly 164,344 people in Los Angeles County, California.
Quick answer: PASADENA WATER AND POWER has no violations on file. One reading is worth knowing about: Lithium was measured at 54.9µg/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
Lithium
Langelier Index (pH(s))
Magnesium
Calcium
Potassium
Sodium
Hardness, Total (ASCACO3)
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Nitrate
Turbidity
pH
TTHM
Chromium, Hex
Chloroform
Perchlorate
Chlorate
Conductivity (at 25°C)
Utility PASADENA WATER AND POWERPopulation served 164,344Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Chromium, Hex
Detected: 1.2 UG/L (ppb)
7/15/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 1.86 UG/L (ppb)
9/30/2025
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: 1.12 UG/L (ppb)
2/25/2025
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
Nitrate
Detected: 5.18 MG/L (ppm)
9/30/2025
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: 21.5 MG/L (ppm)
7/15/2025
Calcium
Detected: 67.2 MG/L (ppm)
7/15/2025
Potassium
Detected: 2.4 MG/L (ppm)
7/15/2025
Sodium
Detected: 30 MG/L (ppm)
7/15/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.549 LANG
7/15/2025
Hardness, Total (ASCACO3)
Detected: 256 MG/L (ppm)
7/15/2025
pH
Detected: 7.31 PH
7/15/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 54.9 µg/L (ppb)
4/8/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 270 MG/L (ppm)
7/15/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 220 MG/L (ppm)
7/15/2025
TDS
Detected: 410 MG/L (ppm)
7/15/2025
Turbidity
Detected: 0.1 NTU
7/15/2025
A measure of water cloudiness from suspended particles.
Perchlorate
Detected: 1.29 UG/L (ppb)
5/13/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Chlorate
Detected: 66.9 UG/L (ppb)
9/2/2025
Conductivity (at 25°C)
Detected: 630 UMHO/CM
7/15/2025
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.