PALO ALTO is served by 1 water provider on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for PALO ALTO, CA
1 water provider on file serving this city.
Quick answer: PALO ALTO'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 67,231 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Magnesium
Sodium
Hardness, Total (ASCACO3)
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Chloride
Sulfate
Fluoride
Nitrate-Nitrite
Nitrate
Turbidity
pH
Odor
Chromium, Hex
Chlorate
Conductivity (at 25°C)
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Monochloroaceticacid
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: 0.53 UG/L (ppb)
9/11/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 41.2 UG/L (ppb)
8/13/2025
TTHM
Detected: 39 UG/L (ppb)
8/13/2025
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: 39 UG/L (ppb)
8/13/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 0.64 UG/L (ppb)
8/13/2025
Dibromochloromethane
Detected: 0.95 UG/L (ppb)
2/10/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 57 MG/L (ppm)
9/24/2025
Sulfate
Detected: 88 MG/L (ppm)
9/24/2025
Fluoride
Detected: 0.22 MG/L (ppm)
9/24/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 2.7 MG/L (ppm)
9/24/2025
Nitrate
Detected: 2.7 MG/L (ppm)
9/24/2025
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: 24 MG/L (ppm)
9/11/2025
Sodium
Detected: 45 MG/L (ppm)
9/11/2025
Calcium
Detected: 95 MG/L (ppm)
9/11/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 330 MG/L (ppm)
9/11/2025
pH
Detected: 7.73 PH
9/11/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 258 MG/L (ppm)
9/11/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 258 MG/L (ppm)
9/11/2025
TDS
Detected: 618 MG/L (ppm)
9/11/2025
Turbidity
Detected: 0.38 NTU
9/11/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 1 TON
9/24/2025
Chlorate
Detected: 280 UG/L (ppb)
9/11/2025
Conductivity (at 25°C)
Detected: 825 UMHO/CM
9/11/2025
Dichloroaceticacid
Detected: 22.2 UG/L (ppb)
8/13/2025
Trichloroaceticacid
Detected: 17.5 UG/L (ppb)
8/13/2025
Monochloroaceticacid
Detected: 1.5 UG/L (ppb)
8/13/2025
Filtration considerations: General system types, not a specific product recommendation.