Serving roughly 44,718 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for HAWTHORNE-CITY WATER DEPT.
1 water provider directly on file, serving roughly 44,718 people in Los Angeles County, California.
Quick answer: HAWTHORNE-CITY WATER DEPT. has no violations on file. One reading is worth knowing about: Potassium was measured at 9.3MG/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
Copper Summary
Lithium
Temperature (CENTIGRADE)
Fluoride
Nitrate
Turbidity
pH, Field
Odor
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Color
Magnesium
Potassium
Sodium
Calcium
Sulfate
Carbon, Total
Nitrogen-Ammoniaas (N)
Utility HAWTHORNE-CITY WATER DEPT.Population served 44,718Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Copper Summary
Detected: 1.505 mg/L (ppm)
12/31/1993
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 9.1 UG/L (ppb)
8/12/2025
TTHM
Detected: 23 UG/L (ppb)
8/12/2025
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: 6.2 UG/L (ppb)
8/12/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 2.3 UG/L (ppb)
8/12/2025
Bromodichloromethane
Detected: 7.1 UG/L (ppb)
8/12/2025
Dibromochloromethane
Detected: 7.4 UG/L (ppb)
8/12/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Fluoride
Detected: 0.7 MG/L (ppm)
9/9/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.4 MG/L (ppm)
8/19/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Sulfate
Detected: 2.3 MG/L (ppm)
9/3/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 16 MG/L (ppm)
9/24/2025
Potassium
Detected: 9.3 MG/L (ppm)
9/24/2025
Sodium
Detected: 97 MG/L (ppm)
9/24/2025
Calcium
Detected: 39 MG/L (ppm)
9/24/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
pH, Field
Detected: 8.2 PH
10/21/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 26.8 µg/L (ppb)
3/13/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Other
Additional substances tested that don't fit neatly into the categories above
Temperature (CENTIGRADE)
Detected: 21.5 C
10/27/2025
Turbidity
Detected: 0.15 NTU
10/21/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 1 TON
9/16/2025
Dichloroaceticacid
Detected: 5.5 UG/L (ppb)
8/12/2025
Trichloroaceticacid
Detected: 1.5 UG/L (ppb)
8/12/2025
Dibromoaceticacid
Detected: 2 UG/L (ppb)
8/12/2025
Color
Detected: 2 UNITS
9/16/2025
Carbon, Total
Detected: 2.3 MG/L (ppm)
10/8/2025
Nitrogen-Ammoniaas (N)
Detected: 1.3 MG/L (ppm)
1/8/2025
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.