Drinking water quality · 2021
· Verified
What's in Willow County Water District — Ukiah, Ca, CA tap water
11 contaminants were measured in the Willow County Water District — Ukiah, Ca, CA water system's 2021 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2021
- Contaminants measured
- 11
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- HAA5
- Service area
- CA
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 603 ug/LReported levelSystem-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. | 11.21 ug/LReported levelSystem-wide | None set | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.92 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0 ug/L90th percentileAt the tap | None set | Within the limit |
| BoronA naturally occurring element from rock and soil. | 160–180 ug/LRangeSystem-wide | 1000 ug/LNL | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 1.09–1.91 pCi/LRangeSystem-wide | 15 pCi/LMCL | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.2–0.5 mg/LRangeSystem-wide | 4 mg/LMCL | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0–0.56 mg/LRangeSystem-wide | 10 mg/LMCL | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0 mg/LReported levelSystem-wide | 4 mg/LMCL | None detected |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Reported levelTotal No. of Detections | None set | None detected |
+By source (2)— Total No. of Detections, No. of Detections
| |||
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0Highest single sampleNo. of Detections | 0MCLG | None detected |
People also ask about Willow County Water District — Ukiah, Ca, CA's water
+Is Willow County Water District — Ukiah, Ca, CA tap water safe to drink in 2021?
The 2021 Consumer Confidence Report for the Willow County Water District — Ukiah, Ca, CA water utility lists 1 contaminant at or above the federal limit: 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 Willow County Water District — Ukiah, Ca, CA tap water?
11 contaminants were measured in Willow County Water District — Ukiah, Ca, CA's 2021 Consumer Confidence Report, spanning metals, disinfection byproducts, and inorganic chemicals. 7 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 Willow County Water District — Ukiah, Ca, CA tap water?
One contaminant in Willow County Water District — Ukiah, Ca, CA's 2021 report sits at or above the federal limit: HAA5 (10.1× 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 Willow County Water District — Ukiah, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2021 report is HAA5, at 10.1× the federal threshold. It belongs to the disinfection byproducts family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Willow County Water District — Ukiah, 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 Willow County Water District — Ukiah, 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.