Page 83 - Beaumont Basin Watermaster

Section 4
Water Quality Conditions

Aluminum. There were 48 water samples taken during the reporting period and tested for
aluminum. Aluminum concentration at all wells was below 50 ug/L, significantly below the
secondary MCL of 200 ug/L. Aluminum above the MCL can add color to water. One well
exceeded the MCL during the FY 2004-08 reporting period.

Arsenic. There were 54 water samples collected and tested for arsenic during the reporting
period. The highest arsenic concentration was observed at SMWC’s Well No. 4; arsenic
concentration at this well has increased from 4.2 mg/L in 2009, to 4.6 mg/L in 2012, to the
latest value of 5.2 mg/L in April 2013. This highest value is slightly over 50 percent the current
primary MCL of 10 mg/L. One well exceeded the MCL during the FY 2004-08 reporting period.

Iron. A total of 48 water samples were taken during the reporting period and tested for iron. Iron
concentration in all but one case was below 100 ug/L., which is significantly below the current
secondary MCL of 300 ug/L. Highest iron concentration was recorded at BCVWD Well No. 4A at
120 ug/L. Iron at a concentration above the MCL can impact color, odor, and taste in water. Five
wells exceeded the MCL during the FY 2004-08 reporting period.

Lead. There were 47 water samples collected and tested for lead during the reporting period. The
highest concentration reported were 0.0065 mg/L at BCVWD Well No. 25 and 0.005 mg/L at
Rancho Calimesa Mobile Home Park Well No. 1. Both of these concentrations are significantly
below the current primary MCL for Lead of 0.015 mg/L. Lead concentrations in water above the
MCL can have significant impacts on human health. One well exceeded the MCL during the FY
2004-08 reporting period.

Manganese. There were 49 water samples taken during the reporting period and tested for
Manganese. Manganese concentration at all wells was below 20 ug/L, significantly below the
secondary MCL of 50 ug/L. Manganese can significantly impact color and taste in water at
concentrations above the MCL. One monitoring well exceeded the MCL during the FY 2004-
08 reporting period.

Total Chromium. A total of 46 water samples were taken during the reporting period and tested
for total chromium. The highest reported concentration of total chromium was 0.02 ug/L (BCVWD
Well No. 3), which is significant less that the current state primary MCL of 0.05 ug/L. One well
exceeded the state primary MCL during the FY 2004-08 reporting period.

Vanadium. Two water samples were tested for vanadium during the reporting period from
SMWC’s Well 4. Vanadium at this well increased significantly during the reporting period from 17
ug/L in March 2010 to 84 ug/L in April 2013. This latest value exceeds the state notification level
of 50 ug/L.

Copper. There were 48 water samples collected and tested for copper during the reporting
period. The highest reported concentration of Copper was 62 ug/L at the Rancho Calimesa
Mobile Home Park Well No. 2; all other wells have concentrations below 50 ug/L, which is
significantly below the state primary MCL of 1,300 ug/L. This is consistent with previous reporting
periods.

Beaumont Basin Watermaster 2013 Annual Report – DRAFT August 2014 4-7