# Signal Hill - City, Water Dept. — Signal Hill, Ca, CA — Drinking Water Quality (2022)

> Contaminant levels for the Signal Hill - City, Water Dept. — Signal Hill, Ca, CA public water system from its 2022 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/signal-hill-city-water-dept-signal-hill-ca/2022
- JSON API: https://www.thewatermap.com/api/water/ca/signal-hill-city-water-dept-signal-hill-ca/2022
- Source: the utility's annual Consumer Confidence Report (CCR)
- Verification: transcribed by a model, cross-checked by a second model, approved before publishing
- Reporting year: 2022
- Contaminants measured: 19
- Contaminants with a federal limit: 9
- Contaminants at or above the federal limit: 0
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| HAA5 | Disinfection byproducts | 12.4 ug/L (Running annual avg) | Distribution System Highest Running | No federal limit | Within the limit |
| TTHM | Disinfection byproducts | 39.4 ug/L (Running annual avg) | Distribution System Highest Running | No federal limit | Within the limit |
| Fluoride | Inorganic chemicals | 0.7 mg/L (Average) | MWD's Surface Water | 4 mg/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | Not detected mg/L (Range) | Treated Groundwater | 10 mg/L (MCL) | None detected |
| Aluminum | Metals | 0.11 mg/L (Average) | MWD's Surface Water | No federal limit | Detected — no federal limit |
| Arsenic | Metals | 2.1 ug/L (Average) | Treated Groundwater | No federal limit | Within the limit |
| Barium | Metals | 0.07 mg/L (Average) | Treated Groundwater | 2 mg/L (MCL) | Within the limit |
| Copper | Metals | 0.22 mg/L (90th percentile) | DISTRIBUTION SYSTEM 90%ile (j) | 1.3 mg/L (Action level) | Within the limit |
| Lead | Metals | 0 ug/L (90th percentile) | DISTRIBUTION SYSTEM 90%ile (j) | No federal limit | None detected |
| Lithium | Metals | 11.7 ug/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Escherichia coli (E. coli) | Microbial | 0 (Average) | Distribution System Average # Positive | No federal limit | None detected |
| Total Coliform | Microbial | 0 (Range) | Distribution System Range Of # Positive | 0 (MCLG) | None detected |
| Chlorine Total | Other | 0.6 mg/L (Running annual avg) | Distribution System Highest Running | 4 mg/L (MCL) | Within the limit |
| Turbidity | Physical & aggregate | 0.25 NTU (Average) | Distribution System | No federal limit | Within the limit |
| Combined Radium | Radionuclides | Not detected (Range) | Treated Groundwater | 5 (MCL) | None detected |
| Gross Alpha | Radionuclides | 1.3 (Average) | Treated Groundwater | 15 (MCL) | Detected — no federal limit |
| Gross Beta Particle Activity | Radionuclides | Not detected (Average) | MWD's Surface Water | No federal limit | None detected |
| Uranium | Radionuclides | 0.5 (Average) | MWD's Surface Water | 20 (MCL) | Detected — no federal limit |
| Benzene | VOCs & pesticides | 2.1 ug/L (Average) | Treated Groundwater | No federal limit | Within the limit |

## What these contaminants are

- **HAA5** — Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
- **TTHM** — Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
- **Fluoride** — A mineral often added to drinking water to help prevent tooth decay. Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.
- **Nitrate** — A compound from fertilizer runoff, septic systems, and erosion of natural deposits. Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
- **Aluminum** — A common element sometimes used as a treatment coagulant. Regulated only as a secondary (cosmetic) standard; high levels can discolor water.
- **Arsenic** — A naturally occurring element that also enters water from industry and agriculture. A known human carcinogen; long-term exposure is linked to skin, bladder, and lung cancer.
- **Barium** — A metal from erosion of natural deposits and industrial discharge. Long-term exposure above the federal limit can raise blood pressure.
- **Copper** — A metal that enters water from corroding household plumbing. Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
- **Lead** — A toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
- **Lithium** — A naturally occurring element found in some groundwater. No enforceable federal limit; on the EPA contaminant candidate list for further study.
- **Escherichia coli (E. coli)** — Escherichia coli — bacteria found in the gut of humans and animals. Its presence in drinking water indicates fecal contamination and a real risk of waterborne illness.
- **Total Coliform** — A group of bacteria used as an indicator of overall water-system sanitation. Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.
- **Turbidity** — A measure of cloudiness from suspended particles in the water. High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
- **Combined Radium** — Combined radium-226 and radium-228 — naturally occurring radioactive elements. Long-term exposure above the federal limit increases the risk of bone cancer.
- **Gross Alpha** — Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances. Long-term exposure above the federal limit increases cancer risk.
- **Gross Beta Particle Activity** — Gross beta particle activity — a combined measure of beta-emitting radioactive substances. Long-term exposure above the federal screening level increases cancer risk.
- **Uranium** — A naturally occurring radioactive metal from erosion of natural deposits. Long-term exposure above the federal limit can damage the kidneys and increase cancer risk.

## How to read this

- A water-quality report covers an entire service area, not a single address.
- 'Federal limit' is the EPA standard (MCL, action level, treatment technique, etc.) that the measured level is compared against.
- 'At or above the federal limit' means the utility's own reported figure met or exceeded that standard.

_Figures are the utility's own published numbers. Generated 2026-06-04 from thewatermap.com._