Drinking water quality · 2023
· Verified
What's in Chino Hills, City of — Chino Hills, Ca, CA tap water
22 contaminants were measured in the Chino Hills, City of — Chino Hills, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2023
- Contaminants measured
- 22
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- Lead
- Service area
- CA
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.
- Maximum contaminant level exceededHealth-based2 violations on record · most recent Jul 1994resolved
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. | 30 ug/LReported levelChino Hills Wells | None set | At or above the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0–6.7 ug/LReported levelMonte Vista Water | None set | Within the limit |
| SeleniumA trace element from natural deposits and industrial discharge. | 0–10 ug/LReported levelChino 1 Desalter | None set | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.24 mg/LReported levelChino Hills Wells | 1.3 mg/LAction level | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 30–50 ug/LReported levelChino 1 Desalter | None set | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | 0–41 ug/LReported levelMonte Vista Water | 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. | 0–56 ug/LReported levelMonte Vista Water | None set | Within the limit |
+By source (3)— Monte Vista Water, Chino Hills Wells, Chino 1 Desalter
| |||
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 0–14 ug/LReported levelMonte Vista Water | None set | Within the limit |
+By source (3)— Monte Vista Water, Chino Hills Wells, Chino 1 Desalter
| |||
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | 0–1.4 ug/LReported levelMonte Vista Water | None set | Detected — no federal limit |
+By source (2)— Monte Vista Water, Chino 1 Desalter
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 2.9–4 mg/LReported levelChino 1 Desalter | 10 mg/LMCL | Within the limit |
+By source (2)— Chino 1 Desalter, Monte Vista Water
| |||
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0–0.26 mg/LReported levelMonte Vista Water | 4 mg/LMCL | Within the limit |
| ChlorideA naturally occurring salt compound. | 98 mg/LReported levelChino 1 Desalter | None set | Detected — no federal limit |
+By source (2)— Chino 1 Desalter, Monte Vista Water
| |||
| SulfateA naturally occurring mineral from rock and soil. | 29–43 mg/LReported levelMonte Vista Water | None set | Detected — no federal limit |
+By source (2)— Monte Vista Water, Chino 1 Desalter
| |||
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChloramineA longer-lasting disinfectant made by combining chlorine with ammonia. | 1.15–1.5 mg/LReported levelChino 1 Desalter | None set | Within the limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Total | 0.64–1.48 mg/LReported levelMonte Vista Water | None set | Within the limit |
+By source (2)— Monte Vista Water, Chino Hills Wells
| |||
| Chromium | 0–0.6 ug/LReported levelChino 1 Desalter | None set | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 0–2.7 pCi/LReported levelChino Hills Water System Monte Vista Water | 15 pCi/LMCL | Within the limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 0–2.1 pCi/LReported levelChino Hills Water System Monte Vista Water | 20 pCi/LMCL | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| OdorA measure of detectable smell in the water. | 1–1Reported levelMonte Vista Water | None set | Detected — no federal limit |
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 350–600 uS/cmReported levelChino 1 Desalter | None set | Detected — no federal limit |
+By source (2)— Chino 1 Desalter, Monte Vista Water
| |||
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 270–400 mg/LReported levelChino 1 Desalter | None set | Detected — no federal limit |
+By source (2)— Chino 1 Desalter, Monte Vista Water
| |||
| TurbidityA measure of cloudiness from suspended particles in the water. | 0–0.6Reported levelMonte Vista Water | 5MCL | Detected — no federal limit |
People also ask about Chino Hills, City of — Chino Hills, Ca, CA's water
+Is Chino Hills, City of — Chino Hills, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the Chino Hills, City of — Chino Hills, Ca, CA water utility lists 1 contaminant at or above the federal limit: Lead. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Chino Hills, City of — Chino Hills, Ca, CA tap water?
22 contaminants were measured in Chino Hills, City of — Chino Hills, Ca, CA's 2023 Consumer Confidence Report, spanning metals, inorganic chemicals, and physical & aggregate. 6 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Chino Hills, City of — Chino Hills, Ca, CA tap water?
One contaminant in Chino Hills, City of — Chino Hills, Ca, CA's 2023 report sits at or above the federal limit: Lead (2.0× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Chino Hills, City of — Chino Hills, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is Lead, at 2.0× the federal threshold. It belongs to the metals family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Chino Hills, City of — Chino Hills, Ca, 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 Chino Hills, City of — Chino Hills, 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 2023 report; a new report will replace it once the utility publishes its next annual update.