Drinking water quality · 2023
· Verified
What's in Carlsbad MWD — Carlsbad, Ca, CA tap water
33 contaminants were measured in the Carlsbad MWD — Carlsbad, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 33
- Over federal limit
- 0
- Approaching the limit
- 2
- Service area
- CA
state-level CCR
Approaching the limit (≥ 80%)
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.
No federal drinking-water violations on record for this system.
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Total | 2–3.9 mg/LReported levelTwin Oaks Plant | None set | Approaching the limit |
+By source (3)— Twin Oaks Plant, Carlsbad Desal Plant, CMWD System Samples
| |||
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 0–8.5 ug/LReported levelTwin Oaks Plant | None set | Approaching the limit |
+By source (2)— Twin Oaks Plant, Skinner Plant Effluent
| |||
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 15–48 ug/LReported levelSkinner Plant Effluent | None set | Within the limit |
+By source (4)— Skinner Plant Effluent, Twin Oaks Plant, CMWD System Samples +1 more
| |||
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 1.2–23 ug/LReported levelSkinner Plant Effluent | None set | Within the limit |
+By source (4)— Skinner Plant Effluent, CMWD System Samples, Twin Oaks Plant +1 more
| |||
| ChlorateA byproduct that can form during disinfection, especially when hypochlorite solutions degrade. | 220–380 ug/LReported levelTwin Oaks Plant | 800 ug/LNL | Detected — no federal limit |
+By source (2)— Twin Oaks Plant, Skinner Plant Effluent
| |||
| NDMA | 2.5 ng/LReported levelSkinner Plant Effluent | 10 ng/LNL | Detected — no federal limit |
+By source (2)— Skinner Plant Effluent, Twin Oaks Plant
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0.0014 mg/L90th percentileAt the tap | 0.015 mg/LAction level | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | Not detected ug/LReported levelSkinner Plant Effluent | None set | None detected |
+By source (2)— Skinner Plant Effluent, Carlsbad Desal Plant
| |||
| CopperA metal that enters water from corroding household plumbing. | 0 mg/LReported levelCMWD System Samples | 1.3 mg/LAction level | None detected |
+By source (2)— CMWD System Samples, Carlsbad Desal Plant
| |||
| BoronA naturally occurring element from rock and soil. | 130 ug/LReported levelSkinner Plant Effluent | 1 ug/LNL | Detected — no federal limit |
+By source (2)— Skinner Plant Effluent, Carlsbad Desal Plant
| |||
| CalciumA naturally occurring mineral that contributes to water hardness. | 61–62 mg/LReported levelSkinner Plant Effluent | None set | Detected — no federal limit |
+By source (2)— Skinner Plant Effluent, Carlsbad Desal Plant
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0–0.32 ug/LReported levelTwin Oaks Plant | None set | Detected — no federal limit |
+By source (3)— Twin Oaks Plant, Skinner Plant Effluent, Carlsbad Desal Plant
| |||
| LithiumA naturally occurring element found in some groundwater. | 10–52.5 ug/LReported levelCMWD System Samples | 9 ug/LPublic health goal | Detected — no federal limit |
+By source (2)— CMWD System Samples, Skinner Plant Effluent
| |||
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 22–23 mg/LReported levelSkinner Plant Effluent | None set | Detected — no federal limit |
+By source (2)— Skinner Plant Effluent, Carlsbad Desal Plant
| |||
| PotassiumA naturally occurring mineral from rock and soil. | 0–33.892 mg/LReported levelCarlsbad Desal Plant | None set | Detected — no federal limit |
+By source (2)— Carlsbad Desal Plant, Skinner Plant Effluent
| |||
| SodiumA naturally occurring salt component. | 91–95 mg/LReported levelSkinner Plant Effluent | None set | Detected — no federal limit |
+By source (2)— Skinner Plant Effluent, Carlsbad Desal Plant
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.03 NTUReported levelTwin Oaks Plant | 1 NTUMCL | Within the limit |
| AlkalinityA measure of the water's capacity to neutralize acids. | 99–120 mg/LReported levelTwin Oaks Plant | None set | Detected — no federal limit |
+By source (3)— Twin Oaks Plant, Skinner Plant Effluent, Carlsbad Desal Plant
| |||
| ColorA measure of visible tint in the water. | 1–2Reported levelSkinner Plant Effluent | None set | Detected — no federal limit |
+By source (3)— Skinner Plant Effluent, Twin Oaks Plant, Carlsbad Desal Plant
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 242–243 mg/LReported levelSkinner Plant Effluent | None set | Detected — no federal limit |
+By source (2)— Skinner Plant Effluent, Carlsbad Desal Plant
| |||
| OdorA measure of detectable smell in the water. | 1Reported levelSkinner Plant Effluent | None set | Detected — no federal limit |
+By source (3)— Skinner Plant Effluent, Twin Oaks Plant, Carlsbad Desal Plant
| |||
| pHA measure of how acidic or basic the water is. | 8.3–8.76Reported levelCarlsbad Desal Plant | None set | Detected — no federal limit |
+By source (3)— Carlsbad Desal Plant, Twin Oaks Plant, Skinner Plant Effluent
| |||
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 903–917Reported levelSkinner Plant Effluent | None set | Detected — no federal limit |
+By source (2)— Skinner Plant Effluent, Carlsbad Desal Plant
| |||
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 2.3–2.6 mg/LReported levelSkinner Plant Effluent | None set | Detected — no federal limit |
+By source (2)— Skinner Plant Effluent, Twin Oaks Plant
| |||
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 474–614 mg/LReported levelTwin Oaks Plant | None set | Detected — no federal limit |
+By source (3)— Twin Oaks Plant, Skinner Plant Effluent, Carlsbad Desal Plant
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | Not detected mg/LReported levelCarlsbad Desal Plant | 10 mg/LMCL | None detected |
+By source (3)— Carlsbad Desal Plant, Twin Oaks Plant, Skinner Plant Effluent
| |||
| ChlorideA naturally occurring salt compound. | 48–110 mg/LReported levelCarlsbad Desal Plant | None set | Detected — no federal limit |
+By source (2)— Carlsbad Desal Plant, Skinner Plant Effluent
| |||
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.6–1.2Reported levelTwin Oaks Plant | None set | Detected — no federal limit |
+By source (3)— Carlsbad Desal Plant, Twin Oaks Plant, Skinner Plant Effluent
| |||
| SulfateA naturally occurring mineral from rock and soil. | 152–217 mg/LReported levelTwin Oaks Plant | None set | Detected — no federal limit |
+By source (3)— Twin Oaks Plant, Skinner Plant Effluent, Carlsbad Desal Plant
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | Not detectedReported levelTwin Oaks Plant | None set | None detected |
+By source (3)— Twin Oaks Plant, CMWD System Samples, Carlsbad Desal Plant
| |||
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0 %Reported levelSkinner Plant Effluent | None set | None detected |
+By source (3)— Skinner Plant Effluent, Twin Oaks Plant, Carlsbad Desal Plant
| |||
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFAS | Not detected ng/LReported levelTwin Oaks Plant | None set | None detected |
+By source (4)— Twin Oaks Plant, Skinner Plant Effluent, CMWD System Samples +1 more
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 0–3 pCi/LReported levelSkinner Plant Effluent | 20 pCi/LMCL | Detected — no federal limit |
+By source (3)— Skinner Plant Effluent, Twin Oaks Plant, Carlsbad Desal Plant
| |||
Source: Carlsbad MWD — Carlsbad, 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 Carlsbad MWD — Carlsbad, Ca, CA's water
+Is Carlsbad MWD — Carlsbad, Ca, CA tap water safe to drink in 2023?
Every one of the 33 contaminants measured in Carlsbad MWD — Carlsbad, 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 Carlsbad MWD — Carlsbad, Ca, CA tap water?
33 contaminants were measured in Carlsbad MWD — Carlsbad, Ca, CA's 2023 Consumer Confidence Report, spanning metals, physical & aggregate, and disinfection byproducts. 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 Carlsbad MWD — Carlsbad, Ca, CA tap water approaching the federal limit?
2 contaminants are between 80% and 100% of the federal limit in this report: Chlorine Total and Bromate. 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 Carlsbad MWD — Carlsbad, 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 Carlsbad MWD — Carlsbad, 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.
More water systems in CA
Oceanside, City of — Oceanside, CaVista Irrigation District — Vista, CaOlivenhain MWD — Encinitas, CaSan Dieguito Wd — Encinitas, CaVallecitos Wd — San Marcos, CaCamp Pendleton (north) — Camp Pendleton, CaCamp Pendleton (south) — Camp Pendleton, CaSanta Fe I.d. — Rancho Santa Fe, CaDel Mar, City of — Del Mar, CaFallbrook Pud — Fallbrook, CaRainbow Municipal Wd — Fallbrook, CaEscondidoEscondido, City ofEscondido, City ofEscondido, City ofRincon Del Diablo MWD (id-a) — Escondido, CaValley Center MWD — Valley Center, CaPoway, City of — Poway, CaCity of San Clemente — San Clemente, CaCity of San Clemente — San Clemente, CaCity of San Clemente — San Clemente, CaCity of San Clemente — San Clemente, CaCity of TemeculaRancho California Water District — Temecula, CaAll water systems →