PASADENA is served by 1 water provider on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
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Results for PASADENA, CA
1 water provider on file serving this city.
Quick answer: PASADENA's water has no violations on file and no single reading stands out against its peers (1 other providers in this area). It serves roughly 164,344 people, and the full breakdown below reflects everything EPA and California have on record for it.
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)
Contaminants found
Metals
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: General system types, not a specific product recommendation.