Page 109 - Beaumont Basin Watermaster

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 34 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 34 water samples were taken during the reporting period and tested
for total chromium. The highest reported concentrations of total chromium were observed in
January 2013 at BCVWD Well 26 at 17 ug/L and in March 2017 at Banning C-3 at 15 ug/L. Both
of these values are significantly below the current state primary MCL of 50 ug/L. One well
exceeded the state primary MCL during the FY 2004-08 reporting period.

Vanadium. Three water samples were tested for vanadium during the reporting period from
SMWC’s Well 4 and YVWD No. 48. Vanadium at the SMWC well has been consistently hovering
around 100 ug/L doubling the state notification level of 50 ug/L. Vanadium concentration at YVWD
No. 48 was 25 ug/L in 2014, but increase to 90 ug/L in the summer of 2017.

Copper. There were 34 water samples collected and tested for copper during the reporting
period. Over the last five years only one well has exceeded the detection limit of 50 ug/L; the
Rancho Calimesa Well No. 2 at 62 ug/L (Feb 2013). This concentration is significantly below the
state primary MCL of 1,300 ug/L. This is consistent with previous reporting periods.

4.2.3 pH
There are two secondary standards for pH, a lower limit of 6.5 and an upper limit of 8.5. With
the exception of one well, all other production wells were within these limits. pH
concentrations ranging from a low of 7.0 to a high of 8.9 (SMWC Well No. 4) with most wells in
the 7.8 to 8.0 range. Four wells in the basin exceeded the upper limit for pH during the FY
2004-08 reporting period.

4.2.4 Turbidity
Turbidity is a measure of the cloudiness of water, and is used to indicate water quality and
filtration effectiveness. All production wells in the Basin were tested for turbidity and none
exceeded the primary federal and state MCL of 5 NTU.

Beaumont Basin Watermaster 2017 Annual Report – DRAFT – February 2018 4-9