Recycled water quality

Water from the East Bayshore and San Ramon Valley recycled water projects is safe for all approved tertiary-treated uses.

Below is a comparison of water quality averages in 2017. EBMUD drinking water averages are provided for comparison. For more information on drinking water quality, see our Annual Water Quality ReportAbbreviations are defined below. Note that drinking water quality is measured at EBMUD treatment plants and in the pipeline system. Recycled water quality is measured only at the treatment plants. For this reason, the actual amount of constituents found in recycled water pipelines may vary slightly from the numbers shown below.

In 2017, the East Bayshore water recycling plant was off-line for most of the year. Averages represent two months of data gathered while the plant was operational in November and December 2017. An official signed lab report for East Bayshore is available upon request.

Constituent


Unit


EBMUD
drinking water

EBRWP
recycled water
Oakland & Emeryville
[note 1]

SRVRWP
recycled water
San Ramon
[note 1]

Aluminum mg/L < 0.05 [5] < 0.05 [5] --
Ammonia mg/L -- [2] 54.6 26
Boron mg/L < 0.1 [5] 0.238 0.59
Calcium mg/L 2 - 32 [3] 21.85 55
Chloride mg/L 8 335  170
Chloramine Residual
(as Chlorine)
mg/L 2.1 2.4 --
Color units 3 38 --
Conductivity mmhos/cm 0.159 1.93 1.33
Copper mg/L < 0.05 [5] < 0.05 [5] --
Fluoride mg/L 0.6 - 1.2 [4] 1.35 --
Hardness mg/L 9 - 140 [3] 140  261
Iron mg/L < 0.1 [5] 0.21 --
Lead mg/L < 0.005 [5] < 0.005 [5] --
Magnesium mg/L 1 - 13 [3] 17.35 30
Manganese mg/L < 0.02 [5] 0.083 0.06
Nitrate (as Nitrogen) mg/L < 0.4 [5] 1.05

0.31

Orthophosphate
(as Phosphorus)
mg/L 0.005 5.25 --
pH 0 - 14 scale 8.3 - 9.4 [3] 7.25 7.43
Potassium mg/L 1 - 2 [3] 40.8 14.2
Silica mg/L 6 - 14 [3] 5.45 19
Sodium mg/L 4 - 30[3] 233.5 145
Sulfate mg/L 14 54 98.2
TDS (Total Dissolved Solids) mg/L 91 860 691
Turbidity NTU 0.03 0.185 MF = 0.07; SF = 1.32
Zinc mg/L < 0.05 [5] < 0.05 [5]  --

Notes 

Note 1
Water quality meets California Department of Public Health Title 22 criteria for tertiary-treated recycled water, using either microfiltration (MF) or sand filtration (SF) methods as well as chlorine and/or ultraviolet light disinfection.
Note 2
There is no drinking water standard for this constituent. The constituent is measured and reported for recycled water.
Note 3
Range of samples.
Note 4
In 2017 state regulations required that fluoride levels in the treated water be maintained between 0.6 to 1.2 mg/l with an optimum dose of 0.7 mg/l.
Note 5
Value represents the potable water Detection Limit for Purposes of Reporting (DLR). Actual results for this constituent are below the DLR.

Abbreviations

EBRWP: East Bayshore Recycled Water Project, an EBMUD project serving Oakland, Emeryville, Berkeley, Albany and Alameda.
SRVRWP: San Ramon Valley Recycled Water Program, a joint project of the Dublin San Ramon Services District & EBMUD serving San Ramon, Danville and Blackhawk.
mg/L: Milligrams per liter, or parts per million
mg/L: Micrograms per liter, or parts per billion
mL: Milliliter, or 0.001 liter; 100 ml = 0.1 liter (1/10)
mmhos/cm: Millimhos per centimeter (equivalent to decisiemens per meter [dS/m], the international unit for electrical conductivity)
MRDLG: Maximum residual disinfectant level goal
NTU: Nephelometric Turbidity Unit
MF: Microfiltration
SF: Sand filtration
UV: Ultraviolet light disinfection