Drinking water quality · 2025
· Verified
What's in Ventura Wwd No. 8 - Simi Valley, CA tap water
109 contaminants were measured in the Ventura Wwd No. 8 - Simi Valley, CA water system's 2025 annual report. Each is shown below against its federal limit.
- Reporting year
- 2025
- Contaminants measured
- 109
- Over federal limit
- 0
- Approaching the limit
- 1
- Service area
- CA
state-level CCR
Approaching the limit (≥ 80%)
Where your water comes from · EPA SDWIS
Ventura Wwd No. 8 - Simi Valley, CA's drinking water comes from ground water, drawn from 3 sources.
Source
3ground water
- WELL · 3
Treatment
1treatment plant
- TAPO CANYON MEMBRANE TP
Distribution
0storage units
Also buys water from CALLEGUAS MUNICIPAL WATER DIST.
Source: EPA SDWIS facilities inventory. Methodology.
Historical readings · EPA Six-Year Review (2012–2019)
20 historically-detected contaminants in Ventura Wwd No. 8 - Simi Valley, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
GROSS BETA worst: 2015 | 3.4 mrem/yr 85% | 4 mrem/yr | '15'17'18 |
TTHM worst: 2013 | 0.063 mg/L within | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
SELENIUM worst: 2018 | 0.039 mg/L within | 0.05 mg/L | '12'14'15'17'18 |
ARSENIC worst: 2018 | 0.0041 mg/L within below national p90 | 0.01 mg/L | '12'15'17'18 |
HAA5 worst: 2018 | 0.018 mg/L within | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE worst: 2012 | 2.71 mg/L within | 10 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2017 | 1.4 mg/L within | 10 mg/L | '17'18'19 |
FLUORIDE worst: 2014 | 0.38 mg/L within | 4 mg/L | '12'14'15'17'18 |
BARIUM worst: 2019 | 0.12 mg/L within near national p90 | 2 mg/L | '19 |
URANIUM worst: 2019 | 0.0179 ug/L within near national p90 | 30 ug/L | '12'14'15'17'18'19 |
COPPER worst: 2017 | 0.1 mg/L below national p90 | — | '17'18 |
DBAA worst: 2012 | 0.0048 mg/L | — | '12'13'14'15'16'17'18'19 |
DCAA worst: 2012 | 0.0025 mg/L | — | '12'13'14'15'16'17'18'19 |
MBAA worst: 2013 | 0.003 mg/L | — | '13 |
MCAA worst: 2018 | 0.0093 mg/L | — | '18 |
TCAA worst: 2013 | 0.0022 mg/L | — | '13'14'15'18'19 |
BROMODICHLOROMETHANE worst: 2012 | 0.0039 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.0074 mg/L | — | '12'13'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.0022 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.0095 mg/L | — | '12'13'14'15'16'17'18'19 |
PWSID CA5610023 · Source: EPA Six-Year Review 4 (2012–2019). Values are the highest detection in each calendar year; non-detect years are omitted. Year tags above show every year with a detection.
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 828.3333333333334 MG/LAverageSource water | 1000 MG/LMCL | Approaching the limit |
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 1108.3333333333333 UMHO/CMAverageSource water | 1600 UMHO/CMMCL | Within the limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.2 NTUAverageEntry point | 5 NTUMCL | Within the limit |
| ColorA measure of visible tint in the water. | Not detected UNITSHighest single sampleEntry point | 15 UNITSMCL | None detected |
| OdorA measure of detectable smell in the water. | Not detected TONHighest single sampleEntry point | 3 TONMCL | None detected |
| AlkalinityA measure of the water's capacity to neutralize acids. | 126.25 MG/LAverageEntry point | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 503.6666666666667 MG/LAverageSource water | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 7.28 PHAverageSource water | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| SulfateA naturally occurring mineral from rock and soil. | 325 MG/LAverageSource water | 500 MG/LMCL | Within the limit |
| ChlorideA naturally occurring salt compound. | 19 MG/LAverageEntry point | 500 MG/LMCL | Within the limit |
| Cyanide | Not detected UG/LHighest single sampleEntry point | 150 UG/LMCL | None detected |
| NitriteA compound from fertilizer runoff, sewage, and erosion of natural deposits. | Not detected MG/LHighest single sampleEntry point | 1 MG/LMCL | None detected |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 3.06 PCI/LAverageEntry point | 15 PCI/LMCL | Within the limit |
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0.7366666666666667 PCI/LAverageSource water | 5 PCI/LMCL | Within the limit |
| RadonA naturally occurring radioactive gas that can dissolve into groundwater. | 319.3 PCI/LAverageEntry point | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.058 UG/LAverageEntry point | 10 UG/LMCL | Within the limit |
| AluminumA common element sometimes used as a treatment coagulant. | Not detected UG/LHighest single sampleEntry point | 1000 UG/LMCL | None detected |
| Antimony | Not detected UG/LHighest single sampleEntry point | 6 UG/LMCL | None detected |
| Beryllium | Not detected UG/LHighest single sampleEntry point | 4 UG/LMCL | None detected |
| Cadmium | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| IronA naturally occurring metal common in groundwater. | Not detected UG/LHighest single sampleEntry point | 300 UG/LMCL | None detected |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected UG/LHighest single sampleDistribution | None set | None detected |
| ManganeseA naturally occurring metal from soil and rock. | Not detected UG/LHighest single sampleEntry point | 50 UG/LMCL | None detected |
| MercuryA toxic metal from erosion of natural deposits and industrial runoff. | Not detected UG/LHighest single sampleEntry point | 2 UG/LMCL | None detected |
| NickelA metal from natural deposits and industrial discharge. | Not detected UG/LHighest single sampleEntry point | 100 UG/LMCL | None detected |
| Strontium | Not detected PCI/LHighest single sampleEntry point | 8 PCI/LMCL | None detected |
| Thallium | Not detected UG/LHighest single sampleEntry point | 2 UG/LMCL | None detected |
| ZincA naturally occurring metal that can also enter water from corroding pipes. | Not detected UG/LHighest single sampleEntry point | 5000 UG/LMCL | None detected |
| BoronA naturally occurring element from rock and soil. | 160 UG/LAverageEntry point | None set | Detected — no federal limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 148.79166666666666 MG/LAverageSource water | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 32.11666666666667 MG/LAverageSource water | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 1.4 MG/LAverageEntry point | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 33 MG/LAverageEntry point | None set | Detected — no federal limit |
| Vanadium | 3.8 UG/LAverageEntry point | None set | Detected — no federal limit |
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| XylenesA group of industrial solvents found in gasoline and paint. | 0.52 UG/LAverageEntry point | 1750 UG/LMCL | Within the limit |
| 1,2,3-TCP | Not detected UG/LHighest single sampleEntry point | 0.005 UG/LMCL | None detected |
| AtrazineA widely used agricultural herbicide that reaches water through runoff. | Not detected UG/LHighest single sampleEntry point | 1 UG/LMCL | None detected |
| Benzene | Not detected UG/LHighest single sampleEntry point | 1 UG/LMCL | None detected |
| Benzo(a)pyrene | Not detected UG/LHighest single sampleEntry point | 0.2 UG/LMCL | None detected |
| ChloroethaneA volatile organic compound used in some industrial processes. | Not detected UG/LHighest single sampleEntry point | None set | None detected |
| Chloromethane | Not detected UG/LHighest single sampleEntry point | None set | None detected |
| Dalapon | Not detected UG/LHighest single sampleEntry point | 200 UG/LMCL | None detected |
| Dichlorodifluoromethane | Not detected UG/LHighest single sampleEntry point | None set | None detected |
| Dichloromethane | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| Ethylbenzene | Not detected UG/LHighest single sampleEntry point | 300 UG/LMCL | None detected |
| Simazine | Not detected UG/LHighest single sampleEntry point | 4 UG/LMCL | None detected |
| Toluene | Not detected UG/LHighest single sampleEntry point | 150 UG/LMCL | None detected |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| N-Nitrosodi-n-butylamine | Not detected UG/LHighest single sampleEntry point | None set | None detected |
| NDMA | Not detected UG/LHighest single sampleEntry point | None set | None detected |
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | Not detected UG/LHighest single sampleEntry point | 6 UG/LMCL | None detected |
| ChlorateA byproduct that can form during disinfection, especially when hypochlorite solutions degrade. | 56 UG/LAverageEntry point | None set | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Carbofuran | Not detected UG/LHighest single sampleEntry point | 18 UG/LMCL | None detected |
| Carbon Tetrachloride | Not detected UG/LHighest single sampleEntry point | 0.5 UG/LMCL | None detected |
| Chlordane | Not detected UG/LHighest single sampleEntry point | 0.1 UG/LMCL | None detected |
| Chlorobenzene | Not detected UG/LHighest single sampleEntry point | 70 UG/LMCL | None detected |
| Chromium | Not detected UG/LHighest single sampleEntry point | 50 UG/LMCL | None detected |
| Cis Dichloroethylene 12 | Not detected UG/LHighest single sampleEntry point | 6 UG/LMCL | None detected |
| Deha | Not detected UG/LHighest single sampleEntry point | 400 UG/LMCL | None detected |
| Dehp | Not detected UG/LHighest single sampleEntry point | 4 UG/LMCL | None detected |
| Dichloroethane 12 | Not detected UG/LHighest single sampleEntry point | 0.5 UG/LMCL | None detected |
| Dichloroethylene 11 | Not detected UG/LHighest single sampleEntry point | 6 UG/LMCL | None detected |
| Dichloropropane 12 | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| Dinoseb | Not detected UG/LHighest single sampleEntry point | 7 UG/LMCL | None detected |
| Diquat | Not detected UG/LHighest single sampleEntry point | 20 UG/LMCL | None detected |
| Edb | Not detected UG/LHighest single sampleEntry point | 0.05 UG/LMCL | None detected |
| Endothall | Not detected UG/LHighest single sampleEntry point | 100 UG/LMCL | None detected |
| Endrin | Not detected UG/LHighest single sampleEntry point | 2 UG/LMCL | None detected |
| Glyphosate | Not detected UG/LHighest single sampleEntry point | 700 UG/LMCL | None detected |
| Heptachlor | Not detected UG/LHighest single sampleEntry point | 0.01 UG/LMCL | None detected |
| Heptachlor Epoxide | Not detected UG/LHighest single sampleEntry point | 0.01 UG/LMCL | None detected |
| Hexachlorobenzene | Not detected UG/LHighest single sampleEntry point | 1 UG/LMCL | None detected |
| Hexachlorocyclopentadiene | Not detected UG/LHighest single sampleEntry point | 50 UG/LMCL | None detected |
| Methoxychlor | Not detected UG/LHighest single sampleEntry point | 30 UG/LMCL | None detected |
| O Dichlorobenzene | Not detected UG/LHighest single sampleEntry point | 600 UG/LMCL | None detected |
| Oxamyl | Not detected UG/LHighest single sampleEntry point | 50 UG/LMCL | None detected |
| P Dichlorobenzene | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| Pcb Total | Not detected UG/LHighest single sampleEntry point | 0.5 UG/LMCL | None detected |
| Pce | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| Pentachlorophenol | Not detected UG/LHighest single sampleEntry point | 1 UG/LMCL | None detected |
| Picloram | Not detected UG/LHighest single sampleEntry point | 500 UG/LMCL | None detected |
| Styrene | Not detected UG/LHighest single sampleEntry point | 100 UG/LMCL | None detected |
| Tce | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| Toxaphene | Not detected UG/LHighest single sampleEntry point | 3 UG/LMCL | None detected |
| Trans Dichloroethylene 12 | Not detected UG/LHighest single sampleEntry point | 10 UG/LMCL | None detected |
| Trichlorobenzene 124 | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| Trichloroethane 111 | Not detected UG/LHighest single sampleEntry point | 200 UG/LMCL | None detected |
| Trichloroethane 112 | Not detected UG/LHighest single sampleEntry point | 5 UG/LMCL | None detected |
| Twofourd | Not detected UG/LHighest single sampleEntry point | 70 UG/LMCL | None detected |
| Vinyl Chloride | Not detected UG/LHighest single sampleEntry point | 0.5 UG/LMCL | None detected |
Source: Ventura Wwd No. 8 - Simi Valley, CA's 2025 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 Ventura Wwd No. 8 - Simi Valley, CA's water
+Is Ventura Wwd No. 8 - Simi Valley, CA tap water safe to drink in 2025?
Every one of the 109 contaminants measured in Ventura Wwd No. 8 - Simi Valley, CA's 2025 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 Ventura Wwd No. 8 - Simi Valley, CA tap water?
109 contaminants were measured in Ventura Wwd No. 8 - Simi Valley, CA's 2025 Consumer Confidence Report, spanning other, metals, and vocs & pesticides. 83 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 Ventura Wwd No. 8 - Simi Valley, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: Total Dissolved Solids. 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 Ventura Wwd No. 8 - Simi Valley, CA's 2025 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 Ventura Wwd No. 8 - Simi Valley, 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 2025 report; a new report will replace it once the utility publishes its next annual update.
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