Drinking water quality · 2023
· Verified
What's in Lopez Project — San Luis Obispo, Ca, CA tap water
16 contaminants were measured in the Lopez Project — San Luis Obispo, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 16
- Over federal limit
- 0
- Approaching the limit
- 1
- Service area
- CA
state-level CCR
Approaching the limit (≥ 80%)
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Free | 3.43 mg/LAverageLopez WTP Treated Water | 4 mg/LMCL | Approaching the limit |
+By source (4)— Lopez WTP Treated Water, Delivered Water, Distribution Range detected +1 more
| |||
| Chlorine Total | 2.74 mg/LAverageLopez WTP Treated Water | 4 mg/LMCL | Within the limit |
+By source (4)— Lopez WTP Treated Water, Distribution Range detected, Delivered Water +1 more
| |||
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorite | 0.68 mg/LAverageLopez WTP Treated Water | 1 mg/LMCL | Within the limit |
+By source (4)— Lopez WTP Treated Water, Delivered Water, Distribution Range detected +1 more
| |||
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 46.5 ug/LAverageDelivered Water | None set | Within the limit |
+By source (4)— Delivered Water, Lopez WTP Treated Water, Distribution Range detected +1 more
| |||
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 27.9 ug/LAverageDistribution Average detected (LRAA High) | None set | Within the limit |
+By source (4)— Distribution Range detected, Distribution Average detected (LRAA High), Delivered Water +1 more
| |||
| ChlorateA byproduct that can form during disinfection, especially when hypochlorite solutions degrade. | 294 ug/LAverageDistribution Average detected (LRAA High) | None set | Detected — no federal limit |
+By source (3)— Distribution Range detected, Delivered Water, Distribution Average detected (LRAA High)
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 3 ug/LAverageLopez WTP | None set | Within the limit |
+By source (2)— Delivered Water, Lopez WTP
| |||
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 2.6 ug/L90th percentileAt the tap | None set | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.058 mg/LAverageLopez WTP Treated Water | 0.3 mg/LPublic health goal | Within the limit |
+By source (2)— Lopez WTP Treated Water, Delivered Water
| |||
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.036 mg/LAverageLopez WTP Treated Water | 2 mg/LMCL | Within the limit |
+By source (2)— Lopez WTP Treated Water, Delivered Water
| |||
| AluminumA common element sometimes used as a treatment coagulant. | Not detected mg/LRangeLopez WTP | None set | None detected |
+By source (2)— Lopez WTP, Delivered Water
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.048 ug/LAverageLopez WTP Treated Water | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.9 pCi/LAverageDelivered Water | 15 pCi/LMCL | Within the limit |
+By source (2)— Lopez WTP Treated Water, Delivered Water
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.32 mg/LAverageDelivered Water | 4 mg/LMCL | Within the limit |
+By source (2)— Delivered Water, Lopez WTP Treated Water
| |||
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 111 ug/LAverageLopez WTP Treated Water | 4000 ug/LMCL | Within the limit |
+By source (4)— Lopez WTP Treated Water, Distribution Range detected, Delivered Water +1 more
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 4AverageDistribution | 0Public health goal | Detected — no federal limit |
+By source (3)— Distribution, Delivered Water, Lopez WTP
| |||
Source: Lopez Project — San Luis Obispo, Ca, CA's 2023 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 Lopez Project — San Luis Obispo, Ca, CA's water
+Is Lopez Project — San Luis Obispo, Ca, CA tap water safe to drink in 2023?
Every one of the 16 contaminants measured in Lopez Project — 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 Lopez Project — San Luis Obispo, Ca, CA tap water?
16 contaminants were measured in Lopez Project — San Luis Obispo, Ca, CA's 2023 Consumer Confidence Report, spanning metals, disinfection byproducts, and other. 9 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 Lopez Project — San Luis Obispo, Ca, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: Chlorine Free. 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 Lopez Project — 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 Lopez Project — 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.
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