Page 108 - Beaumont Basin Watermaster

Section 4
Water Quality Conditions

4.1.1 Total Dissolved Solids

Figure 4-2 shows the maximum TDS concentrations for 55 wells measured within and in the
vicinity of the Beaumont Basin wells during the 2013-2018 reporting period. A total of 30 wells
are located inside the basin with the remaining 25 in the Singleton Basin / Edgar Canyon and
the South Beaumont Basin areas.

The maximum TDS concentrations for domestic wells within the basin ranged from 190 to 370
mg/L and averaged 245 mg/L; this average value is 25 mg/L lower than the average maximum
TDS concentration reported in the 2008-11 Engineering Report indicating that TDS
concentrations have been fairly stable in the last 10 years.

In the Singleton Basin / Edgar Canyon area, the maximum TDS
concentration ranged from 200 to 400 mg/L and averaged 273
This section to be Updated in the mg/L. The average TDS concentration for all samples in this area
FINAL Report was 262 mg/L.

In the South Beaumont Basin, the maximum TDS concentration
ranged from 240 to 690 mg/L and averaged 516 mg/L. The average TDS concentration for all
samples in this area was 470 mg/L.

Average and maximum TDS concentrations for all sampled wells within the basin are as
follows:

Average Avg Max
Well Classification Count Samples
Concentration Concentration
Beaumont Groundwater Basin
Appropriators 15 42 230 245

Overlyiers 11 33 238 252
Other 4 14 260 273
Total 30 89

Singleton Basin / Edgar Canyon Area

All Wells 16 27 262 273

South Beaumont Basin

All Wells 9 55 470 516

Of the 26 potable wells, 11 wells had a maximum concentration below the anti-degradation
objective of 230 mg/L, 14 wells were between the anti-degradation and maximum benefit
objective of 330 mg/L, and one exceeded the maximum benefit objective for the BMZ at 370
mg/L. None of the production wells samples exceeded the secondary federal or state drinking

Beaumont Basin Watermaster 2018 Annual Report – DRAFT - February 2019 4-2