Drinking water quality · 2023
· Verified
What's in City of Pleasanton — Pleasanton, Ca, CA tap water
34 contaminants were measured in the City of Pleasanton — Pleasanton, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit — 3 sit at or above that limit.
- Reporting year
- 2023
- Contaminants measured
- 34
- Over federal limit
- 3
- Approaching the limit
- 2
- Worst contaminant
- PFOS
- Service area
- CA
6.8× the limit
state-level CCR
At or above the federal limit
Approaching the limit (≥ 80%)
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 27.2 ng/LAverageWell 8 | 6.5 ng/LNL | At or above the limit |
+By source (5)— Well 8, Well 6, Well 5 +2 more
| |||
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 23.2 ng/LAverageWell 8 | 3 ng/LNL | At or above the limit |
+By source (5)— Well 8, Well 6, Well 5 +2 more
| |||
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 4.45 ng/LAverageWell 5 | 5.1 ng/LNL | At or above the limit |
+By source (5)— Well 5, Well 8, Well 6 +2 more
| |||
| Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. | Not detectedAverageSurface Water | None set | None detected |
+By source (2)— Surface Water, Groundwater
| |||
| Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.' | Not detected ng/LAverageGroundwater | 10 ng/LMCL | None detected |
+By source (2)— Groundwater, Surface Water
| |||
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 5.9 ng/LAverageWell 8 | 500 ng/LNL | Detected — no federal limit |
+By source (3)— Well 8, Well 6, Well 5
| |||
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 4.2 ng/LAverageWell 8 | None set | Detected — no federal limit |
+By source (3)— Well 8, Well 5, Well 6
| |||
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 78 ug/LRunning annual avgSystem-wide | None set | Approaching the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 55 ug/LRunning annual avgSystem-wide | None set | Approaching the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChloramineA longer-lasting disinfectant made by combining chlorine with ammonia. | 2.41 mg/LRunning annual avgSystem-wide | 4 mg/LPublic health goal | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 3 mg/LAverageGroundwater | 10 mg/LMCL | Within the limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.68 mg/LRunning annual avgSystem-wide | 4 mg/LMCL | Within the limit |
+By source (3)— of Monthly Average, Groundwater, Treated Surface Water
| |||
| ChlorideA naturally occurring salt compound. | 84 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Treated Surface Water, Groundwater
| |||
| SulfateA naturally occurring mineral from rock and soil. | 57 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.33 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 152 ug/LAverageGroundwater | None set | Within the limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0 ug/L90th percentileAt the tap | None set | Within the limit |
| SeleniumA trace element from natural deposits and industrial discharge. | Not detected ug/LAverageGroundwater | None set | Within the limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| BoronA naturally occurring element from rock and soil. | 606 ug/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 4.6 ug/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| ManganeseA naturally occurring metal from soil and rock. | Not detected ug/LAverageTreated Surface Water | None set | Detected — no federal limit |
+By source (2)— Treated Surface Water, Groundwater
| |||
| PotassiumA naturally occurring mineral from rock and soil. | 2.1 mg/LAverageTreated Surface Water | None set | Detected — no federal limit |
+By source (2)— Treated Surface Water, Groundwater
| |||
| SilicaA naturally occurring compound from sand and rock. | 21 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| SodiumA naturally occurring salt component. | 61 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Treated Surface Water, Groundwater
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.06 NTUAverageGroundwater | 1 NTUMCL | Within the limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| AlkalinityA measure of the water's capacity to neutralize acids. | 266 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 309 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| pHA measure of how acidic or basic the water is. | 8.7AverageTreated Surface Water | None set | Detected — no federal limit |
+By source (2)— Treated Surface Water, Groundwater
| |||
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 826AverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 1.1AverageTreated Surface Water | None set | Detected — no federal limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 506 mg/LAverageGroundwater | None set | Detected — no federal limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0 %MaximumSystem-wide | 0 %Public health goal | None detected |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | Not detected pCi/LAverageTreated Surface Water | 15 pCi/LMCL | Within the limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | Not detected pCi/LAverageTreated Surface Water | 20 pCi/LMCL | Detected — no federal limit |
+By source (2)— Groundwater, Treated Surface Water
| |||
Source: City of Pleasanton — Pleasanton, 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 City of Pleasanton — Pleasanton, Ca, CA's water
+Is City of Pleasanton — Pleasanton, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the City of Pleasanton — Pleasanton, Ca, CA water utility lists 3 contaminants at or above the federal limit: PFOS, Perfluorohexanesulfonic acid, and PFOA. 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 City of Pleasanton — Pleasanton, Ca, CA tap water?
34 contaminants were measured in City of Pleasanton — Pleasanton, Ca, CA's 2023 Consumer Confidence Report, spanning metals, pfas ("forever chemicals"), and physical & aggregate. 13 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 City of Pleasanton — Pleasanton, Ca, CA tap water?
3 contaminants in City of Pleasanton — Pleasanton, Ca, CA's 2023 report sit at or above the federal limit: PFOS (6.8× the limit); Perfluorohexanesulfonic acid (2.3× the limit); PFOA (1.1× 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 City of Pleasanton — Pleasanton, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is PFOS, at 6.8× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Are any contaminants in City of Pleasanton — Pleasanton, Ca, CA tap water approaching the federal limit?
2 contaminants are between 80% and 100% of the federal limit in this report: TTHM and HAA5. 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 City of Pleasanton — Pleasanton, 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 City of Pleasanton — Pleasanton, 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.
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