Drinking water quality · 2023
· Verified
What's in Signal Hill - City, Water Dept., CA tap water
20 contaminants were measured in the Signal Hill - City, Water Dept., CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 20
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
state-level CCR
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Treatment technique violationHealth-based5 violations on record · most recent Apr 2025resolved
- Maximum contaminant level exceededHealth-based1 violation on record · most recent Jun 1993resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0.0066 mg/L90th percentileAt the tap | 0.015 mg/LAction level | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 2.2 ug/LAverageTreated Groundwater | None set | Within the limit |
+By source (2)— Treated Groundwater, MWD's Surface Water
| |||
| CopperA metal that enters water from corroding household plumbing. | 0.2 mg/L90th percentileDISTRIBUTION SYSTEM 90%ile (j) | 1.3 mg/LAction level | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.027 mg/LAverageTreated Groundwater | 2 mg/LMCL | Within the limit |
+By source (2)— Treated Groundwater, MWD's Surface Water
| |||
| AluminumA common element sometimes used as a treatment coagulant. | 0.05 mg/LAverageMWD's Surface Water | None set | Detected — no federal limit |
+By source (2)— MWD's Surface Water, Treated Groundwater
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.1 ug/LAverageTreated Groundwater | None set | Detected — no federal limit |
+By source (2)— Treated Groundwater, MWD's Surface Water
| |||
| LithiumA naturally occurring element found in some groundwater. | 15.9 ug/LAverageSystem-wide | None set | Detected — no federal limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 31.5 ug/LRunning annual avgDistribution System Highest Running | None set | Within the limit |
+By source (2)— Distribution System, Distribution System Highest Running
| |||
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 11 ug/LRunning annual avgDistribution System Highest Running | None set | Within the limit |
+By source (2)— Distribution System, Distribution System Highest Running
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.28 NTUAverageDistribution System | None set | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.7 mg/LAverageMWD's Surface Water | 4 mg/LMCL | Within the limit |
+By source (2)— MWD's Surface Water, Treated Groundwater
| |||
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | Not detected mg/LAverageMWD's Surface Water | 10 mg/LMCL | None detected |
+By source (2)— MWD's Surface Water, Treated Groundwater
| |||
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Total | 0.6 mg/LRunning annual avgDistribution System Highest Running | 4 mg/LMCL | Within the limit |
+By source (2)— Distribution System, Distribution System Highest Running
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0AverageDistribution System Average # Positive | None set | None detected |
+By source (2)— Distribution System Average # Positive, Distribution System Range Of # Positive
| |||
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0AverageDistribution System Average # Positive | 0MCLG | None detected |
+By source (2)— Distribution System Average # Positive, Distribution System Range Of # Positive
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | Not detectedAverageTreated Groundwater | 5MCL | None detected |
+By source (2)— Treated Groundwater, MWD's Surface Water
| |||
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 1.3AverageTreated Groundwater | 15MCL | Detected — no federal limit |
+By source (2)— MWD's Surface Water, Treated Groundwater
| |||
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | 2AverageMWD's Surface Water | None set | Detected — no federal limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 0.5AverageMWD's Surface Water | 20MCL | Detected — no federal limit |
+By source (2)— MWD's Surface Water, Treated Groundwater
| |||
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Benzene | Not detected ug/LAverageTreated Groundwater | None set | None detected |
+By source (2)— Treated Groundwater, MWD's Surface Water
| |||
Source: Signal Hill - City, Water Dept., CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.
People also ask about Signal Hill - City, Water Dept., CA's water
+Is Signal Hill - City, Water Dept., CA tap water safe to drink in 2023?
Every one of the 20 contaminants measured in Signal Hill - City, Water Dept., CA's 2023 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Signal Hill - City, Water Dept., CA tap water?
20 contaminants were measured in Signal Hill - City, Water Dept., CA's 2023 Consumer Confidence Report, spanning metals, radionuclides, and disinfection byproducts. 10 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Signal Hill - City, Water Dept., CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Signal Hill - City, Water Dept., CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2023 report; a new report will replace it once the utility publishes its next annual update.
More water systems in CA
Long BeachBellflower Home Garden Water Company — Bellflower, CaWilmingtonCalifornia Water Service Co. - Dominguez — San Jose, CaCerritos - City, Water Dept. — Cerritos, CaHarbor CityNorwalk - City, Water Dept. — Norwalk, CaSan PedroDowney - City, Water Dept. — Downey, CaLiberty Utilities - Compton — Downey, CaDowneyLomita-city, Water Dept. — Lomita, CaWattsCity of Bell Gardens — Downey, CaWalnut Park Mutual Water Co. — Huntington Park, CaTorrance-city, Water Dept.Commerce-city, Water Dept. — San Jose, CaLiberty Park Water Association — Huntington Beach, CaGswc - Southwest — Hawthorne, CaHawthorne-city Water Dept. — San Jose, CaHuntington BeachVernon-city, Water Dept. — Vernon, CaSouth Los AngelesCalifornia Domestic Water Company — Whittier, CaAll water systems →