SIGNAL HILL - CITY, WATER DEPT. Water Quality Report
Serving roughly 11,848 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for SIGNAL HILL - CITY, WATER DEPT.
1 water provider directly on file, serving roughly 11,848 people in Los Angeles County, California.
Quick answer: SIGNAL HILL - CITY, WATER DEPT. has no violations on file. One reading is worth knowing about: Trichloroaceticacid was measured at 3.83UG/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
Lithium
Turbidity
Odor
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Trichloroaceticacid
Dibromoaceticacid
Color
Iron
Manganese
Arsenic
Aggressive Index
Potassium
Magnesium
Calcium
Sodium
Hardness, Total (ASCACO3)
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Chloride
Sulfate
Fluoride
pH
Chromium, Hex
Benzene
Conductivity (at 25°C)
Utility SIGNAL HILL - CITY, WATER DEPT.Population served 11,848Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0029 mg/L (ppm)
12/31/2026
Iron
Detected: 570 UG/L (ppb)
9/18/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 49 UG/L (ppb)
9/18/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Arsenic
Detected: 12 UG/L (ppb)
6/5/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Chromium, Hex
Detected: 0.03 UG/L (ppb)
4/17/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 3.83 UG/L (ppb)
2/20/2025
TTHM
Detected: 9.3 UG/L (ppb)
2/20/2025
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: 1.92 UG/L (ppb)
2/20/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 2.44 UG/L (ppb)
2/20/2025
Bromodichloromethane
Detected: 2.77 UG/L (ppb)
2/20/2025
Dibromochloromethane
Detected: 2.17 UG/L (ppb)
2/20/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 18 MG/L (ppm)
4/17/2025
Sulfate
Detected: 28 MG/L (ppm)
4/17/2025
Fluoride
Detected: 0.37 MG/L (ppm)
4/17/2025
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Potassium
Detected: 1.6 MG/L (ppm)
4/17/2025
Magnesium
Detected: 2.68 MG/L (ppm)
4/17/2025
Calcium
Detected: 31.7 MG/L (ppm)
4/17/2025
Sodium
Detected: 44 MG/L (ppm)
4/17/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 90.2 MG/L (ppm)
4/17/2025
pH
Detected: 7.2 PH
4/17/2025
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: 42 µg/L (ppb)
7/24/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Petroleum Compounds
Substances associated with fuel or petroleum contamination
Benzene
Detected: 1.3 UG/L (ppb)
3/20/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 230 MG/L (ppm)
4/17/2025
Other
Additional substances tested that don't fit neatly into the categories above
Turbidity
Detected: 0.1 NTU
4/17/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 4 TON
9/18/2025
Trichloroaceticacid
Detected: 3.83 UG/L (ppb)
2/20/2025
Dibromoaceticacid
Detected: 1.45 UG/L (ppb)
2/20/2025
Color
Detected: 5 UNITS
4/17/2025
Aggressive Index
Detected: 11.4 AGGR
4/17/2025
Alkalinity, Total
Detected: 190 MG/L (ppm)
4/17/2025
TDS
Detected: 230 MG/L (ppm)
4/17/2025
Conductivity (at 25°C)
Detected: 400 UMHO/CM
4/17/2025
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.