July
1998 Volume 21, Issue 7
EBMUD treated and
untreated water
for 1997 drinking water
Water Quality
Constituents by Reservoir Source
Untreated Water
| Water Quality
Constituent |
DLR |
MCL |
units |
Pardee |
San Pablo |
U.S.L. |
Briones |
| Arsenic |
0.002 |
0.05 |
mg/l |
ND |
ND |
ND-0.002 |
ND |
| Nitrate as N |
0.44 |
10 |
mg/l |
ND |
ND |
ND-.66 |
ND |
| Toluene |
0.0005 |
0.15 |
mg/l |
ND |
ND-0.0010 |
ND |
ND |
| Xylenes |
0.0005 |
1.75 |
mg/l |
ND |
ND-0.0007 |
ND |
ND |
| Chloride |
NS |
500 |
mg/l |
1-2 |
5-10 |
6-28 |
8-13 |
| Detergents |
NS |
0.5 |
mg/l |
ND |
0.04 |
0.03 |
ND |
| Sulfate |
NS |
500 |
mg/l |
0.9-1.8 |
16-26 |
17-32 |
76 |
| Total Dissolved
Solids |
NS |
1000 |
mg/l |
28 |
130 |
120 |
240 |
| Calcium |
NS |
NS |
mg/l |
2.8-3.6 |
18.2 |
20.1-33.6 |
34.6 |
| Total Hardness |
NS |
NS |
mg/l |
9-14 |
55-84 |
77-140 |
81-140 |
| Magnesium |
NS |
NS |
mg/l |
0.9-1.4 |
7.4 |
8.9-14.1 |
10.6 |
| Sodium |
NS |
NS |
mg/l |
1.6-2.0 |
12.3 |
11.7-18.4 |
22.2 |
Water Quality
Constituents by Treatment Plant
Treated Water
| Water Quality
Consitituent |
DLR |
MCL |
Unit |
WTP AVG |
MIN |
MAX |
LAFAYETTE |
ORINDA |
SOBRANTES |
U.S.L |
WALNUT CREEK |
| Aluminum |
0.05 |
0.2 |
mg/l |
0.07 |
ND |
0.7 |
ND-0.14 |
ND-0.7 |
ND-0.07 |
0.07-0.14 |
ND-0.1 |
| Color |
NS |
15 |
units |
2 |
2 |
4 |
3 |
2 |
3 |
4 |
2 |
| Conductivity |
NS |
1600 |
umho/cm |
239 |
54 |
371 |
54 |
58-371 |
220 |
280 |
57 |
| Iron |
NS |
0.3 |
mg/l |
ND |
ND |
0.14 |
ND |
ND-0.14 |
ND |
ND-0.01 |
ND-0.02 |
| Magnesium |
NS |
0.05 |
mg/l |
ND |
ND |
0.01 |
ND |
ND-0.01 |
ND-0.001 |
ND-0.002 |
ND-0.001 |
| Threshold Odor # |
NS |
3 |
TON |
2 |
ND |
7 |
ND-5 |
1-7 |
1-7 |
1-7 |
1-4 |
| Turbity |
NS |
5 |
NTU |
0.07 |
ND |
0.22 |
ND-0.14 |
ND-0.22 |
ND-0.16 |
ND-0.2 |
ND-0.21 |
| Zinc |
NS |
5 |
mg/l |
0.01 |
ND |
0.04 |
ND-0.01 |
ND-0.04 |
ND-0.02 |
ND-0.02 |
ND-0.02 |
| Alkalinity |
|
|
mg/l |
26 |
17 |
74 |
18 |
17 |
70 |
74 |
17 |
| Boron |
|
|
mg/l |
0.03 |
0 |
0.122 |
0.003-0.016 |
0.004-0.113 |
0.010-0.074 |
0.066-0.114 |
0.005-0.122 |
| Calcium |
|
|
mg/l |
12.2 |
4.6 |
38.6 |
4.6-8.0 |
5.1-34.6 |
6.4-21.1 |
18.7-29.9 |
4.6-38.6 |
| Magnesium |
|
|
mg/l |
3.5 |
0.68 |
12.4 |
0.7-1.4 |
0.68-10.0 |
1.3-7.9 |
7.9-12.4 |
0.73-1.12 |
| Hardness |
|
|
mg/l |
38.1 |
11 |
130 |
13-35 |
11-130 |
55-79 |
63-130 |
12-130 |
| pH |
|
|
units |
8.4 |
7.8 |
9 |
7.8-8.4 |
8-8.7 |
8.2-8.5 |
7.8-8.4 |
8.1-9 |
| Potassium |
|
|
mg/l |
ND |
ND |
10.6 |
ND-10.6 |
ND-8.2 |
ND |
ND-8.8 |
ND-4.9 |
| Silica |
|
|
mg/l |
9.02 |
4.6 |
12.8 |
8.6-12.1 |
4.6-11.7 |
10.5-12.8 |
6.1-12.7 |
5.7-12.1 |
| Sodium |
|
|
mg/l |
10.1 |
3.3 |
31.6 |
3.3-4.8 |
3.4-26.1 |
4.6-24.5 |
17.6-31.6 |
2.7-31.1 |
|
