What's in Padre Dam MWD — Santee, Ca, CA tap water

19 contaminants were measured in the Padre Dam MWD — Santee, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.

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Reporting year: 2023
Contaminants measured: 19
Over federal limit: 0
Approaching the limit: 2
Service area: CA
Source: Utility CCR

Approaching the limit (≥ 80%)

Disinfectants

Contaminant	Measured	Federal limit	Status
ChloramineA longer-lasting disinfectant made by combining chlorine with ammonia.	0.52–3.6 mg/LReported levelHelix Levy Plant	None set	Approaching the limit
+By source (4)— SDCWA Twin Oaks Valley Plant, Helix Levy Plant, MWD Skinner Plant +1 more SDCWA Twin Oaks Valley PlantPlant 90% of limit Helix Levy PlantPlant 90% of limit MWD Skinner PlantPlant 90% of limit Carlsbad Desalination PlantPlant 90% of limit

Disinfection byproducts

Contaminant	Measured	Federal limit	Status
BromateA disinfection byproduct formed when bromide-containing water is treated with ozone.	0–8.5 ug/LReported levelSDCWA Twin Oaks Valley Plant	None set	Approaching the limit
+By source (3)— SDCWA Twin Oaks Valley Plant, MWD Skinner Plant, Helix Levy Plant SDCWA Twin Oaks Valley PlantPlant 85% of limit MWD Skinner PlantPlant 60% of limit Helix Levy PlantPlant 0% of limit
HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.	0–8.4 ug/LReported levelSDCWA Twin Oaks Valley Plant	None set	Within the limit
+By source (4)— Helix Levy Plant, SDCWA Twin Oaks Valley Plant, Carlsbad Desalination Plant +1 more Helix Levy PlantPlant 14% of limit SDCWA Twin Oaks Valley PlantPlant 14% of limit Carlsbad Desalination PlantPlant 14% of limit MWD Skinner PlantPlant 14% of limit

Metals

Contaminant	Measured	Federal limit	Status
ArsenicA naturally occurring element that also enters water from industry and agriculture.	0–4.9 ug/LReported levelHelix Levy Plant	None set	Within the limit
+By source (3)— Helix Levy Plant, Carlsbad Desalination Plant, MWD Skinner Plant Helix Levy PlantPlant 49% of limit Carlsbad Desalination PlantPlant 0% of limit MWD Skinner PlantPlant 0% of limit
CopperA metal that enters water from corroding household plumbing.	0.28 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.	0.002 mg/L90th percentileAt the tap	0.015 mg/LAction level	Within the limit
BariumA metal from erosion of natural deposits and industrial discharge.	95–122 ug/LReported levelSDCWA Twin Oaks Valley Plant	2000 ug/LMCL	Within the limit
+By source (4)— SDCWA Twin Oaks Valley Plant, Helix Levy Plant, MWD Skinner Plant +1 more SDCWA Twin Oaks Valley PlantPlant 6% of limit Helix Levy PlantPlant 0% of limit MWD Skinner PlantPlant 0% of limit Carlsbad Desalination PlantPlant 0% of limit
SeleniumA trace element from natural deposits and industrial discharge.	Not detected ug/LReported levelMWD Skinner Plant	None set	None detected
+By source (3)— MWD Skinner Plant, Helix Levy Plant, Carlsbad Desalination Plant MWD Skinner PlantPlant 0% of limit Helix Levy PlantPlant 0% of limit Carlsbad Desalination PlantPlant 0% of limit
AluminumA common element sometimes used as a treatment coagulant.	60–230 ug/LReported levelHelix Levy Plant	None set	Detected — no federal limit
+By source (4)— Helix Levy Plant, MWD Skinner Plant, SDCWA Twin Oaks Valley Plant +1 more Helix Levy PlantPlant MWD Skinner PlantPlant SDCWA Twin Oaks Valley PlantPlant Carlsbad Desalination PlantPlant

Radionuclides

Contaminant	Measured	Federal limit	Status
Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances.	0–4 pCi/LReported levelMWD Skinner Plant	15 pCi/LMCL	Within the limit
+By source (4)— MWD Skinner Plant, Helix Levy Plant, Carlsbad Desalination Plant +1 more MWD Skinner PlantPlant 27% of limit Helix Levy PlantPlant 25% of limit Carlsbad Desalination PlantPlant 0% of limit SDCWA Twin Oaks Valley PlantPlant 0% of limit
Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements.	0.3–0.93 pCi/LReported levelCarlsbad Desalination Plant	5 pCi/LMCL	Within the limit
+By source (4)— Carlsbad Desalination Plant, Helix Levy Plant, SDCWA Twin Oaks Valley Plant +1 more Carlsbad Desalination PlantPlant 19% of limit Helix Levy PlantPlant 0% of limit SDCWA Twin Oaks Valley PlantPlant 0% of limit MWD Skinner PlantPlant 0% of limit
Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances.	0–5 pCi/LReported levelMWD Skinner Plant	None set	Detected — no federal limit
+By source (4)— MWD Skinner Plant, SDCWA Twin Oaks Valley Plant, Helix Levy Plant +1 more MWD Skinner PlantPlant SDCWA Twin Oaks Valley PlantPlant Helix Levy PlantPlant Carlsbad Desalination PlantPlant
UraniumA naturally occurring radioactive metal from erosion of natural deposits.	0–3 pCi/LReported levelMWD Skinner Plant	20 pCi/LMCL	Detected — no federal limit
+By source (4)— MWD Skinner Plant, SDCWA Twin Oaks Valley Plant, Helix Levy Plant +1 more MWD Skinner PlantPlant SDCWA Twin Oaks Valley PlantPlant Helix Levy PlantPlant Carlsbad Desalination PlantPlant

Inorganic chemicals

Contaminant	Measured	Federal limit	Status
FluorideA mineral often added to drinking water to help prevent tooth decay.	0.3–0.9 mg/LReported levelHelix Levy Plant	4 mg/LMCL	Within the limit
+By source (4)— Helix Levy Plant, Carlsbad Desalination Plant, MWD Skinner Plant +1 more Helix Levy PlantPlant 23% of limit Carlsbad Desalination PlantPlant 20% of limit MWD Skinner PlantPlant 20% of limit SDCWA Twin Oaks Valley PlantPlant 18% of limit
NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits.	Not detected mg/LReported levelHelix Levy Plant	10 mg/LMCL	None detected
+By source (3)— Helix Levy Plant, Carlsbad Desalination Plant, MWD Skinner Plant Helix Levy PlantPlant 0% of limit Carlsbad Desalination PlantPlant 0% of limit MWD Skinner PlantPlant 0% of limit

Physical & aggregate

Contaminant	Measured	Federal limit	Status
TurbidityA measure of cloudiness from suspended particles in the water.	0.01–0.13 NTUReported levelHelix Levy Plant	None set	Within the limit
+By source (4)— Helix Levy Plant, SDCWA Twin Oaks Valley Plant, Carlsbad Desalination Plant +1 more Helix Levy PlantPlant 13% of limit SDCWA Twin Oaks Valley PlantPlant 9% of limit Carlsbad Desalination PlantPlant 8% of limit MWD Skinner PlantPlant 7% of limit

Other

Contaminant	Measured	Federal limit	Status
Chromium	0–0.32 ug/LReported levelSDCWA Twin Oaks Valley Plant	None set	Within the limit
+By source (4)— SDCWA Twin Oaks Valley Plant, Carlsbad Desalination Plant, Helix Levy Plant +1 more SDCWA Twin Oaks Valley PlantPlant 0% of limit Carlsbad Desalination PlantPlant 0% of limit Helix Levy PlantPlant 0% of limit MWD Skinner PlantPlant 0% of limit

Microbial

Contaminant	Measured	Federal limit	Status
Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals.	0Reported levelMWD Skinner Plant	None set	None detected
+By source (4)— MWD Skinner Plant, SDCWA Twin Oaks Valley Plant, Helix Levy Plant +1 more MWD Skinner PlantPlant SDCWA Twin Oaks Valley PlantPlant Helix Levy PlantPlant Carlsbad Desalination PlantPlant
Total ColiformA group of bacteria used as an indicator of overall water-system sanitation.	Not detected %Reported levelCarlsbad Desalination Plant	None set	None detected
+By source (4)— Carlsbad Desalination Plant, MWD Skinner Plant, SDCWA Twin Oaks Valley Plant +1 more Carlsbad Desalination PlantPlant MWD Skinner PlantPlant SDCWA Twin Oaks Valley PlantPlant Helix Levy PlantPlant

Source: Padre Dam MWD — Santee, 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.