Drinking water quality · 2023
· Verified
What's in East Bay Mud (ebmud) — Oakland, Ca, CA tap water
29 contaminants were measured in the East Bay Mud (ebmud) — Oakland, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 29
- 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
East Bay Mud (ebmud) — Oakland, Ca, CA's drinking water comes from surface water, drawn from 9 sources.
Source
9surface water
- BRIONES RESERVOIR
- LAFAYETTE WTP INTAKE
- ORINDA WTP INTAKE
- PARDEE RESERVOIR
- + 5 more
Treatment
6treatment plants
- LAFAYETTE WTP
- ORINDA WTP
- SOBRANTE WTP
- + 3 more
Distribution
0storage units
Also buys water from CONTRA COSTA WATER DISTRICT.
Source: EPA SDWIS facilities inventory. Methodology.
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 50 ug/LAverageSystem-wide | None set | Approaching the limit |
+By source (2)— Walnut Creek, USL
| |||
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 57 ug/LAverageSystem-wide | None set | Within the limit |
+By source (2)— Walnut Creek, USL
| |||
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 0–1.7 ug/LReported levelSobrante | 0.1 ug/LPublic health goal | Within the limit |
| ChlorateA byproduct that can form during disinfection, especially when hypochlorite solutions degrade. | 108 ug/LAverageEBMUD Results System | 800 ug/LNL | Detected — no federal limit |
+By source (3)— USL, EBMUD Results System, Walnut Creek
| |||
| NDMA | 3.9 ng/LAverageEBMUD Results System | 10 ng/LNL | Detected — no federal limit |
+By source (3)— USL, EBMUD Results System, Walnut Creek
| |||
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChloramineA longer-lasting disinfectant made by combining chlorine with ammonia. | 2.4 mg/LAverageSystem-wide | 4 mg/LPublic health goal | Within the limit |
+By source (2)— Walnut Creek, USL
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.7 mg/LAverageSystem-wide | 1 mg/LPublic health goal | Within the limit |
+By source (2)— USL, Walnut Creek
| |||
| ChlorideA naturally occurring salt compound. | 6 mg/LAverageSystem-wide | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| SulfateA naturally occurring mineral from rock and soil. | 7 mg/LAverageSystem-wide | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.02 NTUAverageSystem-wide | 1 NTUMCL | Within the limit |
+By source (2)— USL, Walnut Creek
| |||
| AlkalinityA measure of the water's capacity to neutralize acids. | 130–140 mg/LReported levelUSL | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 140–160 mg/LReported levelUSL | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| pHA measure of how acidic or basic the water is. | 9.1–9.4Reported levelOrinda | None set | Detected — no federal limit |
+By source (2)— Walnut Creek, USL
| |||
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 127AverageSystem-wide | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 5.1–6.6 mg/LReported levelUSL | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 65 mg/LAverageSystem-wide | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | Not detected pCi/LAverageSystem-wide | 0 pCi/LPublic health goal | Within the limit |
+By source (2)— USL, Walnut Creek
| |||
| Gross Beta Particle ActivityGross beta particle activity — a combined measure of beta-emitting radioactive substances. | 6.1 pCi/LAverageSystem-wide | 0 pCi/LPublic health goal | Detected — no federal limit |
+By source (2)— Walnut Creek, USL
| |||
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AluminumA common element sometimes used as a treatment coagulant. | Not detected ug/LAverageSystem-wide | 600 ug/LPublic health goal | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| BoronA naturally occurring element from rock and soil. | Not detected ug/LAverageEBMUD Results System | 1 ug/LNL | Detected — no federal limit |
+By source (3)— USL, EBMUD Results System, Walnut Creek
| |||
| CalciumA naturally occurring mineral that contributes to water hardness. | 33–34 mg/LReported levelUSL | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | Not detected ug/LAverageSystem-wide | 0.2 ug/LPublic health goal | Detected — no federal limit |
+By source (2)— Walnut Creek, USL
| |||
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 13–14 mg/LReported levelUSL | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| PotassiumA naturally occurring mineral from rock and soil. | 2 mg/LReported levelUSL | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| SilicaA naturally occurring compound from sand and rock. | 10–12 mg/LReported levelSobrante | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
| SodiumA naturally occurring salt component. | 32–35 mg/LReported levelUSL | None set | Detected — no federal limit |
+By source (2)— USL, Walnut Creek
| |||
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0.3 %Reported levelWalnut Creek | 0 %Public health goal | Detected — no federal limit |
+By source (2)— Walnut Creek, USL
| |||
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detected ng/LAverageEBMUD Results System | 1 ng/LNL | Detected — no federal limit |
+By source (3)— USL, EBMUD Results System, Walnut Creek
| |||
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detected ng/LAverageEBMUD Results System | None set | Detected — no federal limit |
+By source (3)— USL, Walnut Creek, EBMUD Results System
| |||
Source: East Bay Mud (ebmud) — Oakland, 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 East Bay Mud (ebmud) — Oakland, Ca, CA's water
+Is East Bay Mud (ebmud) — Oakland, Ca, CA tap water safe to drink in 2023?
Every one of the 29 contaminants measured in East Bay Mud (ebmud) — Oakland, Ca, CA's 2023 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 East Bay Mud (ebmud) — Oakland, Ca, CA tap water?
29 contaminants were measured in East Bay Mud (ebmud) — Oakland, Ca, CA's 2023 Consumer Confidence Report, spanning metals, physical & aggregate, and disinfection byproducts. 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.
+Are any contaminants in East Bay Mud (ebmud) — Oakland, Ca, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: 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 East Bay Mud (ebmud) — Oakland, 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 East Bay Mud (ebmud) — Oakland, 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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