Page 95 - Beaumont Basin Watermaster - DRAFT 2016 Annual Report

The maximum Nitrate-N concentrations for domestic wells owned by Appropriators ranged
from 0.6 to 3.6 mg/L and averaged 2.3 mg/L. Maximum concentrations for overlying wells was
slightly higher as it ranged from 1.2 to 6.1 mg/L and averaged 2.9 mg/L. The average
concentration for all potable wells was 2.0 mg/L.

In the Singleton Basin / Edgar Canyon area, the maximum Nitrate-N concentration ranged
from 1.9 to 19.0 mg/L and averaged 7.5 mg/L. The average concentration for all samples in
this area was 6.3 mg/L.

In the South Beaumont Basin, the maximum Nitrate-N concentration ranged from 4.0 to 22.0
mg/L and averaged 12.3 mg/L. The average concentration for all samples in this area was
10.7 mg/L.

Average and maximum Nitrate-N concentrations for all sampled wells within the basin are as
follows:

Average Avg Max
Well Classification Count Samples
Concentration Concentration
Beaumont Groundwater Basin

Appropriators 23 159 1.7 2.3
Overlyiers 10 21 2.8 2.9
Other 7 8 3.0 3.0
Total 50 188 2.2 2.6

Singleton Basin / Edgar Canyon Area

All Wells 8 16 6.3 7.5

South Beaumont Basin
All Wells 10 44 10.7 12.3

Of the 33 potable wells, 14 wells had a maximum concentration below the anti-degradation
objective of 1.5 mg/L, 22 wells were between the anti-degradation and maximum benefit
objective of 5.0 mg/L, and four exceeded the maximum benefit objective for the BMZ. None of
the production wells samples exceeded the primary federal or state drinking water standard for
Nitrate-N (10 mg/L). BCVWD wells along Edgar Canyon were not included in the analysis of
domestic wells.

In the Singleton Basin / Edgar Canyon area, four wells had a maximum concentration below
the anti-degradation objective and four wells exceeded the maximum benefit objective of 5.0
mg/L. There were no wells with nitrate concentrations between the anti-degradation and
maximum objectives.

In the South Beaumont Basin, one well had a maximum concentration below the anti-
degradation objective; all other nine wells in this area exceeded the maximum objective of 5.0
mg/L. There were no wells with nitrate concentrations between the anti-degradation and

Beaumont Basin Watermaster 2016 Annual Report – DRAFT – August 2017 4-3