SAN JOSE is served by 3 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for SAN JOSE, CA
3 water providers on file serving this city.
Quick answer: SAN JOSE's water has no violations on file and no single reading stands out against its peers (3 other providers in this area). It serves roughly 101,265 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
Nitrate
Chromium, Hex
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Perfluorobutanesulfonicacid (PFBS)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoropentanoicacid (PFPEA)
Perfluorobutanoicacid (PFBA)
Perfluoroheptanoicacid (PFHPA)
Perfluorononanoicacid (PFNA)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorodecanoicacid (PFDA)
Perfluorododecanoicacid (PFDOA)
Perfluorohexanoicacid (PFHXA)
Perfluoroundecanoicacid (PFUNA)
11cl-Pf3ouds
9cl-Pf3ons
Adona
Hfpo-Da
Perfluorooctanesulfonicacid6:2fts
Perfluorohexanesulfonicacid4:2fts
Perfluorodecanesulfonicacid8:2fts
Perfluoropfmpa
Perfluoropfmba
Perfluoropfeesa
Nonafluoronfdha
Perfluoropentanesulfonicacid (PFPES)
Perfluoroheptanesulfonicacid (PFHPS)
Bromoform
Dibromoaceticacid
Copper Summary
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Orthophosphate
pH, Field
Conductivity (at 25°C)
Lithium, Total
Aggressive Index
Langelier Index (pH(s))
Magnesium
Sodium
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
Found at 3 providers
Chromium, Hex
Detected: 4.8 UG/L (ppb)
Found at 2 providers
Copper Summary
Detected: 1.35 mg/L (ppm)
12/31/1993
Lithium, Total
Detected: 11 UG/L (ppb)
2/27/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 51.8 UG/L (ppb)
Found at 2 providers
TTHM
Detected: 63.85 UG/L (ppb)
Found at 3 providers
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: 62.34 UG/L (ppb)
Found at 2 providers
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 6.21 UG/L (ppb)
Found at 3 providers
Dibromochloromethane
Detected: 9.18 UG/L (ppb)
Found at 3 providers
Bromoform
Detected: 6.93 UG/L (ppb)
Found at 2 providers
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 2.8 MG/L (ppm)
Found at 2 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Chloride
Detected: 18 MG/L (ppm)
3/12/2025
Sulfate
Detected: 74 MG/L (ppm)
3/12/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Calcium
Detected: 51 MG/L (ppm)
10/14/2025
Magnesium
Detected: 14 MG/L (ppm)
3/12/2025
Sodium
Detected: 22 MG/L (ppm)
3/12/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Orthophosphate
Detected: 0.24 MG/L (ppm)
10/22/2025
pH, Field
Detected: 7.7 PH
10/14/2025
Langelier Index (pH(s))
Detected: -0.51 LANG
3/12/2025
Hardness, Total (ASCACO3)
Detected: 150 MG/L (ppm)
3/12/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 14 µg/L (ppb)
Found at 3 providers
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: 150 MG/L (ppm)
10/14/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 33.6 UG/L (ppb)
Found at 2 providers
Trichloroaceticacid
Detected: 18.2 UG/L (ppb)
Found at 2 providers
Perfluorobutanesulfonicacid (PFBS)
Detected: 2.3 NG/L (ppt)
7/29/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 5.1 NG/L (ppt)
7/29/2025
Perfluoropentanoicacid (PFPEA)
Detected: 2.6 NG/L (ppt)
5/21/2025
Perfluorobutanoicacid (PFBA)
Detected: 13 NG/L (ppt)
5/21/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 14 NG/L (ppt)
5/21/2025
Perfluorononanoicacid (PFNA)
Detected: 15 NG/L (ppt)
5/21/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 16 NG/L (ppt)
5/21/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 21 NG/L (ppt)
5/21/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorodecanoicacid (PFDA)
Detected: 13 NG/L (ppt)
5/21/2025
Perfluorododecanoicacid (PFDOA)
Detected: 12 NG/L (ppt)
5/21/2025
Perfluorohexanoicacid (PFHXA)
Detected: 11 NG/L (ppt)
5/21/2025
Perfluoroundecanoicacid (PFUNA)
Detected: 13 NG/L (ppt)
5/21/2025
11cl-Pf3ouds
Detected: 20 NG/L (ppt)
5/21/2025
9cl-Pf3ons
Detected: 21 NG/L (ppt)
5/21/2025
Adona
Detected: 16 NG/L (ppt)
5/21/2025
Hfpo-Da
Detected: 11 NG/L (ppt)
5/21/2025
Perfluorooctanesulfonicacid6:2fts
Detected: 13 NG/L (ppt)
5/21/2025
Perfluorohexanesulfonicacid4:2fts
Detected: 11 NG/L (ppt)
5/21/2025
Perfluorodecanesulfonicacid8:2fts
Detected: 16 NG/L (ppt)
5/21/2025
Perfluoropfmpa
Detected: 11 NG/L (ppt)
5/21/2025
Perfluoropfmba
Detected: 12 NG/L (ppt)
5/21/2025
Perfluoropfeesa
Detected: 13 NG/L (ppt)
5/21/2025
Nonafluoronfdha
Detected: 8.3 NG/L (ppt)
5/21/2025
Perfluoropentanesulfonicacid (PFPES)
Detected: 9.7 NG/L (ppt)
5/21/2025
Perfluoroheptanesulfonicacid (PFHPS)
Detected: 14 NG/L (ppt)
5/21/2025
Dibromoaceticacid
Detected: 1.5 UG/L (ppb)
Found at 2 providers
Alkalinity, Total
Detected: 150 MG/L (ppm)
10/14/2025
Conductivity (at 25°C)
Detected: 540 UMHO/CM
10/14/2025
Aggressive Index
Detected: 11.6 AGGR
3/12/2025
TDS
Detected: 280 MG/L (ppm)
3/12/2025
Filtration considerations: General system types, not a specific product recommendation.