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East Bay MUD

Oakland, CA · serves 1,405,000 · Surface waterCA0110005
All clear
All monitored contaminants within federal limits. Last updated from the most recent CCR and EPA monitoring data available.
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Measured in your 2023 water report
From your utility's Consumer Confidence Report · 21 contaminants tested
Above limit
Approaching limit
Within limits
Regulated contaminants — legally enforceable limits
NDMA▸
1.8 ng/L
CA notificationCalifornia advisory
What is it?
N-Nitrosodimethylamine — an industrial contaminant and disinfection byproduct. Can form when water containing certain organic nitrogen compounds is treated with chloramine.
Why it matters
No federal MCL. California's Notification Level is 10 ng/L. NDMA is a potent carcinogen at very low concentrations.
What to do
If detected above the notification level, UV treatment by the utility is the primary solution. Home reverse osmosis filters can provide additional reduction.
Disinfection byproducts
Bromate▸
0.0012 mg/L
MCLlegally enforceable
What is it?
A disinfection byproduct formed when water containing bromide is treated with ozone.
Why it matters
Long-term exposure above the MCL of 0.010 mg/L is associated with increased cancer risk.
What to do
Bromate is not removable by typical home filters. If above the MCL, contact your utility.
HAA5▸
47 µg/L
MCLlegally enforceable
What is it?
Another group of disinfection byproducts formed when chlorine reacts with natural organic matter. HAA5 measures the five most common species.
Why it matters
Long-term exposure above the MCL of 60 µg/L (0.060 mg/L) is associated with increased cancer risk. Like THMs, the MCL is based on a running annual average.
What to do
Activated carbon filters can reduce HAA5. If your system consistently approaches the limit, a reverse osmosis filter provides more complete removal.
TTHM▸
61 µg/L
MCLlegally enforceable
What is it?
Formed when chlorine used to disinfect water reacts with natural organic matter. Includes chloroform, bromoform, and related compounds. The trade-off: disinfection prevents waterborne disease, but creates these byproducts.
Why it matters
Long-term exposure above the MCL of 80 µg/L (0.080 mg/L) is associated with increased cancer risk and possible reproductive effects. The MCL is based on a running annual average, not a single sample.
What to do
If your system is near or above the limit, an activated carbon filter (including pitcher filters like Brita) can reduce THMs. Running water for a minute before drinking also helps, as THMs are volatile and dissipate.
Disinfectants — MRDL
Chloramines▸
2.5 mg/L
MRDLlegally enforceable
What is it?
A longer-lasting disinfectant formed by combining chlorine with ammonia. Used by many utilities because it maintains residual protection further into the distribution system.
Why it matters
Same MRDL as chlorine (4 mg/L). Chloramines are toxic to fish and dialysis patients must use special water treatment. For general consumption at normal levels, not a health concern.
What to do
If you have a fish tank, use a dechloraminating water conditioner. Standard carbon filters remove chloramines more slowly than chlorine — look for catalytic carbon filters if chloramine taste bothers you.
WHO recommendation
Chlorate▸
112 µg/L
WHO guidelineinternational, unenforced
What is it?
A byproduct of water disinfection with chlorine dioxide, and a contaminant from some herbicides.
Why it matters
No federal MCL. The WHO guideline is 700 µg/L. Chlorate may interfere with thyroid function at high levels.
What to do
No action needed at typical detection levels.
Sodium▸
7 mg/L
WHO guidelineinternational, unenforced
What is it?
Naturally present in most water sources. Also increases from road salt, water softeners, and natural mineral deposits.
Why it matters
There is no federal MCL for sodium. The WHO suggests a guideline of 200 mg/L for people on sodium-restricted diets. For most people, sodium in water is a small fraction of dietary intake.
What to do
If you're on a sodium-restricted diet and your water is above 20 mg/L, talk to your doctor. For most people, no action needed.
OTHER
FluorideC (ppm)▸
0.7 mg/L
No additional information available for this contaminant.
% of limit

Other measurements

These describe characteristics of the water that aren’t health risks at typical levels — mineral content, taste, hardness, and similar.

Hardness
▸
1 mg/L· soft
pH
▸
9.4 SU· basic
Alkalinity
▸
29 mg/L
Calcium
▸
6 mg/L
Chloride
▸
7 mg/L
(EPA secondary standard: 250 mg/L)
Magnesium
▸
2 mg/L
Potassium
▸
1 mg/L
Silica
▸
12 mg/L
Specific Conductance
▸
117 µmhos/cm
(EPA secondary standard: 1600 µmhos/cm)
Sulfate
▸
9 mg/L
(EPA secondary standard: 250 mg/L)
TDS
▸
69 mg/L
(EPA secondary standard: 500 mg/L)
TOC
▸
3.4 mg/L

CCR data in early access — values are extracted from utility PDFs and may contain errors. Verify with your utility's 2023 CCR report.

Source: EAST BAY MUD Consumer Confidence Report 2023 · Extracted by WaterScore
Measured data
Private Well Risk

Do you have or use a private well? Measured concentrations from nearby private wells sampled within 5 miles.

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Surface water
Water Sources

Oakland draws from surface water — Briones Reservoir, Lafayette Wtp Intake, San Pablo Resrvoir - San Pablo Intake, Orinda Wtp Intake, Pardee Reservoir, San Pablo Reservoir - Sobrante Intake, Upper San Leandro Reservoir, Walnut Creek Wtp Intake, Freeport Regional Water Project, and Ccwd Ebmud Untreated Water Intertie. Drought directly affects reservoir levels and river flow. Emergency backup sources are available if primary supplies are disrupted.

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