What's in Ventura, CA tap water

32 contaminants were measured in the Ventura, CA water system's 2023 annual report. Each is shown below against its federal limit.

Browse the mapFull source report ↗

Reporting year: 2023
Contaminants measured: 32
Over federal limit: 0
Approaching the limit: 0
Service area: CA
Source: Utility CCR

All within federal limits. Every measured contaminant in this report is below its federal threshold.

Where your water comes from · EPA SDWIS

Ventura, CA's drinking water comes from ground water, drawn from 2 sources.

Source

2ground water

SATICOY CC
SATICOY CC WELL 02

Treatment

2treatment plants

SATICOT CC CLUB WELL 02 - CL2 TREATED
WELL 03 CL2 TRT

Distribution

2storage units

Source: EPA SDWIS facilities inventory. Methodology.

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.

Maximum contaminant level exceededHealth-based
1 violation on record · most recent Jan 2025
resolved

Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗

Disinfection byproducts

Contaminant	Measured	Federal limit	Status
HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.	46.8 ug/LAverageSystem-wide	None set	Within the limit

Disinfectants

Contaminant	Measured	Federal limit	Status
ChloramineA longer-lasting disinfectant made by combining chlorine with ammonia.	2.3 mg/LAverageDistribution System	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.	6.7 pCi/LAverageGround Water	15 pCi/LMCL	Within the limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg6.7 pCi/Lrange5.2–9.2 pCi/L61% of limit Ventura RiverPlant avgNot detected pCi/Lrange0–3.1 pCi/L21% of limit Casitas MWDZone avgNot detected pCi/LrangeNot detected pCi/L0% of limit
UraniumA naturally occurring radioactive metal from erosion of natural deposits.	3.2 pCi/LAverageGround Water	20 pCi/LMCL	Detected — no federal limit
+By source (2)— Ground Water, Ventura River Ground WaterPlant avg3.2 pCi/Lrange1.8–5.06 pCi/L Ventura RiverPlant avg2.7 pCi/Lrange1.8–3.7 pCi/L

Inorganic chemicals

Contaminant	Measured	Federal limit	Status
NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits.	2.8 mg/LAverageVentura River	10 mg/LMCL	Within the limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg2 mg/Lrange0–7.2 mg/L72% of limit Ventura RiverPlant avg2.8 mg/Lrange2.1–3.5 mg/L35% of limit Casitas MWDZone avgNot detected mg/LrangeNot detected mg/L0% of limit
FluorideA mineral often added to drinking water to help prevent tooth decay.	0.5 mg/LAverageVentura River	4 mg/LMCL	Within the limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg0.44 mg/Lrange0.3–0.6 mg/L15% of limit Ventura RiverPlant avg0.5 mg/Lrange0.4–0.5 mg/L13% of limit Casitas MWDZone avg0.3 mg/Lrange0.3 mg/L8% of limit
BromideA naturally occurring salt found in source water.	47 ug/LAverageVentura River	None set	Detected — no federal limit
ChlorideA naturally occurring salt compound.	73 mg/LAverageGround Water	None set	Detected — no federal limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg73 mg/Lrange48–100 mg/L Ventura RiverPlant avg38 mg/Lrange36–43 mg/L Casitas MWDZone avg22 mg/Lrange22 mg/L
SulfateA naturally occurring mineral from rock and soil.	631 mg/LAverageGround Water	None set	Detected — no federal limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg631 mg/Lrange565–763 mg/L Ventura RiverPlant avg267 mg/Lrange205–289 mg/L Casitas MWDZone avg166 mg/Lrange166 mg/L

Metals

Contaminant	Measured	Federal limit	Status
SeleniumA trace element from natural deposits and industrial discharge.	0.014 mg/LAverageGround Water	0.05 mg/LMCL	Within the limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg0.014 mg/Lrange0–0.029 mg/L58% of limit Ventura RiverPlant avg0.002 mg/Lrange0–0.006 mg/L12% of limit Casitas MWDZone avgNot detected mg/LrangeNot detected mg/L0% of limit
CopperA metal that enters water from corroding household plumbing.	0.33 mg/L90th percentileDistribution System	1.3 mg/LAction level	Within the limit
BariumA metal from erosion of natural deposits and industrial discharge.	0.13 mg/LAverageCasitas MWD	2 mg/LMCL	Within the limit
+By source (3)— Casitas MWD, Ventura River, Ground Water Casitas MWDZone avg0.13 mg/Lrange0.13 mg/L7% of limit Ventura RiverPlant avgNot detected mg/LrangeNot detected mg/L0% of limit Ground WaterPlant avgNot detected mg/LrangeNot detected mg/L0% of limit
ArsenicA naturally occurring element that also enters water from industry and agriculture.	Not detected ug/LAverageVentura River	None set	Within the limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avgNot detected ug/Lrange0–7 ug/L70% of limit Ventura RiverPlant avgNot detected ug/LrangeNot detected ug/L0% of limit Casitas MWDZone avgNot detected ug/LrangeNot detected ug/L0% of limit
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.	Not detected mg/L90th percentileDistribution System	0.015 mg/LAction level	Within the limit
BoronA naturally occurring element from rock and soil.	0.2 mg/LAverageCasitas MWD	None set	Detected — no federal limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg0.07 mg/Lrange0–0.5 mg/L Ventura RiverPlant avg0.13 mg/Lrange0–0.4 mg/L Casitas MWDZone avg0.2 mg/Lrange0.2 mg/L
CalciumA naturally occurring mineral that contributes to water hardness.	142 mg/LAverageDistribution System	None set	Detected — no federal limit
IronA naturally occurring metal common in groundwater.	Not detected mg/LAverageVentura River	None set	Detected — no federal limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avgNot detected mg/Lrange0–0.054 mg/L Ventura RiverPlant avgNot detected mg/LrangeNot detected mg/L Casitas MWDZone avgNot detected mg/LrangeNot detected mg/L
LithiumA naturally occurring element found in some groundwater.	74 ug/LAverageTreated Groundwater	None set	Detected — no federal limit
+By source (3)— Treated Groundwater, Treated Ventura River, Casitas MWD Treated GroundwaterPlant avg74 ug/Lrange48–140 ug/L Treated Ventura RiverPlant avg33 ug/Lrange29–36 ug/L Casitas MWDZone avg15 ug/Lrange14–15 ug/L
MagnesiumA naturally occurring mineral that contributes to water hardness.	51 mg/LAverageGround Water	None set	Detected — no federal limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg51 mg/Lrange34–80 mg/L Ventura RiverPlant avg32 mg/Lrange30–32 mg/L Casitas MWDZone avg25 mg/Lrange25 mg/L
ManganeseA naturally occurring metal from soil and rock.	0.0083 mg/LAverageTreated Groundwater	None set	Detected — no federal limit
+By source (5)— Ground Water, Treated Groundwater, Treated Surface Water +2 more Ground WaterPlant avgNot detected mg/Lrange0–0.039 mg/L Treated GroundwaterPlant avg0.0083 mg/Lrange0.007–0.014 mg/L Treated Surface WaterPlant avg0.00055 mg/Lrange0–0.0014 mg/L Casitas MWDZone avgNot detected mg/LrangeNot detected mg/L Ventura RiverPlant avgNot detected mg/LrangeNot detected mg/L
PotassiumA naturally occurring mineral from rock and soil.	5.1 mg/LAverageGround Water	None set	Detected — no federal limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg5.1 mg/Lrange4–8 mg/L Ventura RiverPlant avg2.2 mg/Lrange2–3 mg/L Casitas MWDZone avg3 mg/Lrange3 mg/L
SodiumA naturally occurring salt component.	128 mg/LAverageGround Water	None set	Detected — no federal limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg128 mg/Lrange87–213 mg/L Ventura RiverPlant avg49 mg/Lrange46–55 mg/L Casitas MWDZone avg28 mg/Lrange28 mg/L
ZincA naturally occurring metal that can also enter water from corroding pipes.	0.023 mg/LAverageVentura River	None set	Detected — no federal limit
+By source (3)— Ventura River, Ground Water, Casitas MWD Ventura RiverPlant avg0.023 mg/Lrange0–0.07 mg/L Ground WaterPlant avgNot detected mg/LrangeNot detected mg/L Casitas MWDZone avgNot detected mg/LrangeNot detected mg/L

PFAS ("forever chemicals")

Contaminant	Measured	Federal limit	Status
PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products.	Not detected ng/LAverageGround Water	4 ng/LMCL	None detected

Physical & aggregate

Contaminant	Measured	Federal limit	Status
TurbidityA measure of cloudiness from suspended particles in the water.	Not detected NTUAverageDistribution System	1 NTUMCL	Within the limit
+By source (3)— Distribution System, Ventura River, Casitas Municipal Water District (CMWD) Distribution SystemZone avgNot detected NTUrange0–3.4 NTU340% of limit Ventura RiverPlant 24% of limit Casitas Municipal Water District (CMWD)Zone 7% of limit
AlkalinityA measure of the water's capacity to neutralize acids.	227 mg/LAverageDistribution System	None set	Detected — no federal limit
HardnessA measure of dissolved calcium and magnesium minerals.	37AverageGround Water	None set	Detected — no federal limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg37range29–53 Ventura RiverPlant avg26 NTUrange25–26 NTU Casitas MWDZone avg15range15
pHA measure of how acidic or basic the water is.	7.5AverageDistribution System	None set	Detected — no federal limit
Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content.	1791AverageGround Water	None set	Detected — no federal limit
+By source (4)— Ground Water, Distribution System, Ventura River +1 more Ground WaterPlant avg1791range1546–2050 Distribution SystemZone avg1354range674–1869 Ventura RiverPlant avg1078 NTUrange1070–1099 NTU Casitas MWDZone avg628range628
TOCTotal organic carbon — a measure of organic material dissolved in the water.	2.1 mg/LAverageVentura River	None set	Detected — no federal limit
Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts.	1376 mg/LAverageGround Water	None set	Detected — no federal limit
+By source (3)— Ground Water, Ventura River, Casitas MWD Ground WaterPlant avg1376 mg/Lrange1210–1614 mg/L Ventura RiverPlant avg778 mg/Lrange750–820 mg/L Casitas MWDZone avg420 mg/Lrange420 mg/L

Microbial

Contaminant	Measured	Federal limit	Status
Total ColiformA group of bacteria used as an indicator of overall water-system sanitation.	1.32 %MaximumDistribution System Monthly	None set	Detected — no federal limit

Source: Ventura, 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.