Drinking water quality · 2023
· Verified
What's in San Luis Obispo Water Department — San Luis Obispo, Ca, CA tap water
15 contaminants were measured in the San Luis Obispo Water Department — San Luis Obispo, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 15
- Over federal limit
- 0
- Approaching the limit
- 2
- Service area
- CA
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 27–75 ug/LRangeSystem-wide | None set | Approaching the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 21–49 ug/LRangeSystem-wide | None set | Approaching the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.09–1.9 mg/LRangeSystem-wide | None set | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, TotalTotal chromium — the sum of all chromium forms, from natural deposits and industrial discharge. | 24–24 ug/LRangeSystem-wide | None set | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 2–2 ug/LRangeSystem-wide | None set | Within the limit |
| SeleniumA trace element from natural deposits and industrial discharge. | 6 ug/LReported levelSystem-wide | None set | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.15 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | 0.05–0.15 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| LithiumA naturally occurring element found in some groundwater. | 10–10 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 32 mg/LReported levelSystem-wide | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0–0.9 mg/LRangeSystem-wide | 4 mg/LMCL | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 0.735–0.735 pCi/LRangeSystem-wide | 15 pCi/LMCL | Within the limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HardnessA measure of dissolved calcium and magnesium minerals. | 126–317 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 26–43RangeSystem-wide | None set | Detected — no federal limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 100Reported levelSystem-wide | None set | Detected — no federal limit |
People also ask about San Luis Obispo Water Department — San Luis Obispo, Ca, CA's water
+Is San Luis Obispo Water Department — San Luis Obispo, Ca, CA tap water safe to drink in 2023?
Every one of the 15 contaminants measured in San Luis Obispo Water Department — San Luis Obispo, Ca, CA's 2023 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 San Luis Obispo Water Department — San Luis Obispo, Ca, CA tap water?
15 contaminants were measured in San Luis Obispo Water Department — San Luis Obispo, Ca, CA's 2023 Consumer Confidence Report, spanning metals, physical & aggregate, and disinfection byproducts. 3 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Are any contaminants in San Luis Obispo Water Department — San Luis Obispo, Ca, CA tap water approaching the federal limit?
2 contaminants are between 80% and 100% of the federal limit in this report: TTHM and HAA5. 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 San Luis Obispo Water Department — San Luis Obispo, 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 San Luis Obispo Water Department — San Luis Obispo, 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.