Drinking water quality · 2021
· Verified
What's in Norwalk - City, Water Dept. — Norwalk, Ca, CA tap water
20 contaminants were measured in the Norwalk - City, Water Dept. — Norwalk, Ca, CA water system's 2021 annual report. Each is shown below against its federal limit.
- Reporting year
- 2021
- Contaminants measured
- 20
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
state-level CCR
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 39.3 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. | 10.9 ug/LRunning annual avgDistribution System Highest Running | None set | Within the limit |
+By source (2)— Distribution System, Distribution System Highest Running
| |||
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Total | 1.3 mg/LRunning annual avgDistribution System Highest Running | 4 mg/LMCL | Within the limit |
+By source (2)— Distribution System, Distribution System Highest Running
| |||
| Chromium | 0.1 ug/LAverageGroundwater | None set | Within the limit |
+By source (2)— Groundwater, MWD's Surface Water
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.34 mg/L90th percentileDistribution System | 1.3 mg/LAction level | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0.6 ug/LAverageGroundwater | None set | Within the limit |
+By source (2)— Groundwater, MWD's Surface Water
| |||
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.11 mg/LAverageMWD's Surface Water | 2 mg/LMCL | Within the limit |
+By source (2)— MWD's Surface Water, Groundwater
| |||
| AluminumA common element sometimes used as a treatment coagulant. | 0.14 mg/LAverageMWD's Surface Water | None set | Detected — no federal limit |
+By source (2)— MWD's Surface Water, Groundwater
| |||
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Benzene | 1.2 ug/LAverageGroundwater | None set | Within the limit |
+By source (2)— Groundwater, MWD's Surface Water
| |||
| TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing. | 0.44AverageGroundwater | 5MCL | Detected — no federal limit |
+By source (2)— Groundwater, MWD's Surface Water
| |||
| TrichloroethyleneAn industrial solvent (TCE) used in metal degreasing. | 0.42AverageGroundwater | 5MCL | Detected — no federal limit |
+By source (2)— Groundwater, MWD's Surface Water
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 2.3 mg/LAverageGroundwater | 10 mg/LMCL | Within the limit |
+By source (2)— Groundwater, MWD's Surface Water
| |||
| 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, Groundwater
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.2 NTUAverageDistribution System | None set | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0 %AverageDistribution System Average % Positive | None set | None detected |
+By source (2)— Distribution System Average % Positive, Distribution System Range % Positive
| |||
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0.4 %AverageDistribution System Average % Positive | None set | Detected — no federal limit |
+By source (2)— Distribution System Range % Positive, Distribution System Average % Positive
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | Not detectedAverageGroundwater | 5MCL | Detected — no federal limit |
+By source (2)— MWD's Surface Water, Groundwater
| |||
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 4.6AverageGroundwater | 15MCL | Detected — no federal limit |
+By source (2)— Groundwater, MWD's Surface Water
| |||
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | 6AverageMWD's Surface Water | None set | Detected — no federal limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 3.8AverageGroundwater | 20MCL | Detected — no federal limit |
+By source (2)— Groundwater, MWD's Surface Water
| |||
Source: Norwalk - City, Water Dept. — Norwalk, Ca, CA's 2021 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 Norwalk - City, Water Dept. — Norwalk, Ca, CA's water
+Is Norwalk - City, Water Dept. — Norwalk, Ca, CA tap water safe to drink in 2021?
Every one of the 20 contaminants measured in Norwalk - City, Water Dept. — Norwalk, Ca, CA's 2021 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 Norwalk - City, Water Dept. — Norwalk, Ca, CA tap water?
20 contaminants were measured in Norwalk - City, Water Dept. — Norwalk, Ca, CA's 2021 Consumer Confidence Report, spanning metals, radionuclides, and vocs & pesticides. 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 Norwalk - City, Water Dept. — Norwalk, Ca, CA's 2021 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 Norwalk - City, Water Dept. — Norwalk, Ca, 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 2021 report; a new report will replace it once the utility publishes its next annual update.
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