Drinking water quality · 2023
· Verified
What's in St. Helena, City of — St. Helena, Ca, CA tap water
6 contaminants were measured in the St. Helena, City of — St. Helena, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit — 3 sit at or above that limit.
- Reporting year
- 2023
- Contaminants measured
- 6
- Over federal limit
- 3
- Approaching the limit
- 1
- Worst contaminant
- Barium
- Service area
- CA
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| BariumA metal from erosion of natural deposits and industrial discharge. | 40 mg/LAverageSystem-wide | 2 mg/LMCL | At or above the limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 4.6 NTUReported levelSystem-wide | None set | At or above the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 61.71 ug/LAverageSystem-wide | None set | At or above the limit |
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 64.76 ug/LAverageSystem-wide | None set | Approaching the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.93 mg/LAverageSystem-wide | None set | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.11 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
People also ask about St. Helena, City of — St. Helena, Ca, CA's water
+Is St. Helena, City of — St. Helena, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the St. Helena, City of — St. Helena, Ca, CA water utility lists 3 contaminants at or above the federal limit: Barium, Turbidity, and HAA5. 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 St. Helena, City of — St. Helena, Ca, CA tap water?
6 contaminants were measured in St. Helena, City of — St. Helena, Ca, CA's 2023 Consumer Confidence Report, spanning disinfection byproducts, disinfectants, and inorganic chemicals. 2 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 St. Helena, City of — St. Helena, Ca, CA tap water?
3 contaminants in St. Helena, City of — St. Helena, Ca, CA's 2023 report sit at or above the federal limit: Barium (20.0× the limit); Turbidity (4.6× the limit); HAA5 (1.0× 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 St. Helena, City of — St. Helena, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is Barium, at 20.0× the federal threshold. It belongs to the metals family of contaminants.
+Are any contaminants in St. Helena, City of — St. Helena, Ca, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: TTHM. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from St. Helena, City of — St. Helena, 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 St. Helena, City of — St. Helena, 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.