Drinking water quality · 2023
· Verified
What's in Mendota, City of — Mendota, Ca, CA tap water
43 contaminants were measured in the Mendota, City of — Mendota, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit — 7 sit at or above that limit.
- Reporting year
- 2023
- Contaminants measured
- 43
- Over federal limit
- 7
- Approaching the limit
- 0
- Worst contaminant
- Arsenic
- Service area
- CA
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0–6.7 mg/LRangeSystem-wide | None set | At or above the limit |
| SeleniumA trace element from natural deposits and industrial discharge. | 5–50 ug/LRangeSystem-wide | None set | At or above the limit |
| CopperA metal that enters water from corroding household plumbing. | Not detected mg/L90th percentileAt the tap | 1.3 mg/LAction level | None detected |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected ug/L90th percentileAt the tap | None set | Within the limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 70–100 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0.05–1 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 2.2 mg/LRangeSystem-wide | None set | Detected — no federal limit |
VOCs & pesticides
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 28–82 ug/LRangeSystem-wide | None set | At or above the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 4.8–14 ug/LRangeSystem-wide | None set | Within the limit |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 0–0.004 ug/LRangeSystem-wide | None set | At or above the limit |
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 0–0.004 ug/LRangeSystem-wide | None set | At or above the limit |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 0.0058 ug/LReported levelSystem-wide | None set | Within the limit |
| Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. | 0–0.005 ug/LRangeSystem-wide | None set | Within the limit |
| Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.' | 0–0.004 ug/LRangeSystem-wide | None set | Within the limit |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid, a chlorinated PFAS compound. | 0–0.005 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)ADONA, a newer-generation PFAS replacement compound. | 0–0.003 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid, a chlorinated PFAS compound. | 0.00215 ug/LReported levelSystem-wide | None set | Detected — no federal limit |
| Nonafluoro-3,6-dioxaheptanoic acidNonafluoro-3,6-dioxaheptanoic acid, a PFAS-related compound. | 0–0.02 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluoro-3-methoxypropanoic acid (PFMPA)Perfluoro-3-methoxypropanoic acid, a PFAS-related compound. | 0–0.004 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluoro-4-methoxybutanoic acid (PFMBA)Perfluoro-4-methoxybutanoic acid, a PFAS-related compound. | 0–0.003 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)Perfluoro(2-ethoxyethane)sulfonic acid, a PFAS-related compound. | 0–0.003 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 0.00345 ug/LReported levelSystem-wide | None set | Detected — no federal limit |
| Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.' | 0–0.003 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluorododecanoic acid (PFDoA)Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.' | 0–0.003 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.' | 0–0.003 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | 0–0.003 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 0–0.003 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.' | 0–0.004 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | 0.0035 ug/LReported levelSystem-wide | None set | Detected — no federal limit |
| Perfluoroundecanoic acid (PFUnA)Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.' | 0.00215 ug/LReported levelSystem-wide | None set | Detected — no federal limit |
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | 0–0.005 ug/LRangeSystem-wide | None set | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Total | 0.06–2.46 mg/LRangeSystem-wide | 4 mg/LMCL | Within the limit |
| Alachlor | 1 ug/LRangeSystem-wide | None set | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0–1.1 pCi/LRangeSystem-wide | 5 pCi/LMCL | Within the limit |
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 0–6.07RangeSystem-wide | 15MCL | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.4–0.64 mg/LRangeSystem-wide | 4 mg/LMCL | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Highest single sampleNo. of Detections | 0MCLG | None detected |
+By source (2)— No. of Detections, Total No. of Detections
| |||
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0Highest single sampleNo. of Detections | None set | None detected |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Bicarbonate | 20–1000 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 1–5 ug/LRangeSystem-wide | 5 ug/LMCL | Detected — no federal limit |
People also ask about Mendota, City of — Mendota, Ca, CA's water
+Is Mendota, City of — Mendota, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the Mendota, City of — Mendota, Ca, CA water utility lists 7 contaminants at or above the federal limit: Arsenic, Benzene, TTHM, Selenium, PFOA, PFOS, and Simazine. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Mendota, City of — Mendota, Ca, CA tap water?
43 contaminants were measured in Mendota, City of — Mendota, Ca, CA's 2023 Consumer Confidence Report, spanning pfas ("forever chemicals"), metals, and vocs & pesticides. 7 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Mendota, City of — Mendota, Ca, CA tap water?
7 contaminants in Mendota, City of — Mendota, Ca, CA's 2023 report sit at or above the federal limit: Arsenic (670.0× the limit); Benzene (26.0× the limit); TTHM (1.0× the limit); Selenium (1.0× the limit); PFOA (1.0× the limit); PFOS (1.0× the limit); Simazine (1.0× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Mendota, City of — Mendota, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is Arsenic, at 670.0× the federal threshold. It belongs to the metals family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Mendota, City of — Mendota, 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 Mendota, City of — Mendota, 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.