Serving roughly 30,997 people in Contra Costa County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CITY OF MARTINEZ
1 water provider directly on file, serving roughly 30,997 people in Contra Costa County, California.
Quick answer: CITY OF MARTINEZ has no violations on file. One reading is worth knowing about: Chloroform was measured at 14UG/L, among the highest of the 179 providers on file in this area. It's the most notable figure in this system's record among its 179 local peers.
Lead Summary
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Dibromoaceticacid
Trichloroaceticacid
Aggressive Index
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Sulfate
Chloride
Fluoride
Nitrate
Turbidity
pH
Odor
Chromium, Hex
Nickel
Chromium
Barium
Copper, Free
Aluminum
Conductivity (at 25°C)
Bromide
Nitrate-Nitrite
Iron
Manganese
Cyanide
Utility CITY OF MARTINEZPopulation served 30,997Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Chromium, Hex
Detected: 0.061 UG/L (ppb)
7/10/2025
Nickel
Detected: 1.2 UG/L (ppb)
7/10/2025
Chromium
Detected: 1.7 UG/L (ppb)
7/10/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 24 UG/L (ppb)
7/10/2025
Copper, Free
Detected: 2.5 UG/L (ppb)
7/10/2025
Aluminum
Detected: 23 UG/L (ppb)
7/10/2025
Iron
Detected: 1400 UG/L (ppb)
1/14/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 33 UG/L (ppb)
1/14/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 2.5 UG/L (ppb)
7/9/2025
TTHM
Detected: 20 UG/L (ppb)
7/9/2025
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: 14 UG/L (ppb)
7/9/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 5.6 UG/L (ppb)
1/8/2025
Bromodichloromethane
Detected: 4.9 UG/L (ppb)
7/9/2025
Dibromochloromethane
Detected: 1.5 UG/L (ppb)
7/9/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 35 MG/L (ppm)
7/10/2025
Chloride
Detected: 29 MG/L (ppm)
7/10/2025
Fluoride
Detected: 0.72 MG/L (ppm)
7/10/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.1 MG/L (ppm)
7/10/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 0.37 MG/L (ppm)
1/14/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 7.4 MG/L (ppm)
7/10/2025
Potassium
Detected: 1.7 MG/L (ppm)
7/10/2025
Sodium
Detected: 34 MG/L (ppm)
7/10/2025
Calcium
Detected: 13 MG/L (ppm)
7/10/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 64 MG/L (ppm)
7/10/2025
pH
Detected: 8.2 PH
7/10/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Bromide
Detected: 0.15 MG/L (ppm)
1/14/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 76.1 MG/L (ppm)
9/16/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 2.5 UG/L (ppb)
7/9/2025
Dibromoaceticacid
Detected: 2.8 UG/L (ppb)
1/8/2025
Trichloroaceticacid
Detected: 2.9 UG/L (ppb)
4/2/2025
Aggressive Index
Detected: 12 AGGR
7/10/2025
Alkalinity, Total
Detected: 76.1 MG/L (ppm)
9/16/2025
TDS
Detected: 170 MG/L (ppm)
7/10/2025
Turbidity
Detected: 0.15 NTU
7/10/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 1 TON
7/10/2025
Conductivity (at 25°C)
Detected: 300 UMHO/CM
7/10/2025
Cyanide
Detected: 1.2 UG/L (ppb)
1/14/2025
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.