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Water Quality Results

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Distribution System Monitoring

Monthly samples are taken at four dedicated sampling stations located throughout the City’s water distribution system. The locations for these sites were chosen to reflect the overall water quality of the system. Samples are analyzed for boron, calcium, magnesium, hardness (as CaCO3), and free chlorine.

Most Recent Water Hardness and Boron Test Results

December 17, 2025

 Water Hardness (CaCO3)   Boron
  Location  grains per gallon* milligrams per liter 
  milligrams per liter
 Whaleback Park (West Davis) 5.15 88 <0.100
 Mockingbird Place (North Davis) 4.97 85 <0.100
 El Macero Drive (South Davis) 5.20 89 <0.100
 1st Street (Central Davis) 4.80 82 <0.100
 Alhambra Drive (East Davis) 4.91 84 <0.100
 *grains per gallon is calculated by dividing the milligrams per liter result by 17.1

2025 Water Hardness and Boron Test Results

2025
Location Analyte Units Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Average
Whaleback Park (West Davis) Hardness (CaCO3) milligrams per liter 100 42 76 93 89 93 56 77 85 57 65 88
grains per gallon 5.85 2.46 4.44 5.44 5.20 5.44 3.27 4.50 4.97 3.33 3.80 5.15
Boron milligrams per liter 0.540 0.120 0.280 0.440 0.400 0.470 <0.100 0.190 0.200 <0.100 <0.100
 <0.100
Mockingbird Place (North Davis) Hardness (CaCO3) milligrams per liter 72 58 78 83 87 90 62 79 77 62 71 85
grains per gallon 4.21 3.39 4.56 4.85 5.09 5.26 3.63 4.62 4.50 3.63 4.15 4.97
Boron milligrams per liter 0.440 0.350 0.260 0.350 0.390 0.470 0.120 0.250 0.150 0.100
 0.120
 <0.100
El Macero Drive (South Davis) Hardness (CaCO3) milligrams per liter 58 68 79 67 60 68 52 64 68 57 66 89
grains per gallon 3.39 3.98 4.62 3.92 3.51 3.98 3.04 3.74 3.98 3.33 3.86 5.20
Boron milligrams per liter <0.100 0.820 0.370 0.430 0.280 0.410 0.110 0.230 0.110 <0.100
 0.280 <0.100
1st Street (Central Davis) Hardness (CaCO3) milligrams per liter 86 56 73 61 81 78 57 93 75 54 75 82
grains per gallon 5.03 3.27 4.27 3.57 4.74 4.56 3.33 5.44 4.39 3.16 4.39 4.80
Boron milligrams per liter 0.370 0.220 0.190 0.130 0.280 0.320 0.110 0.300 0.120 <0.100
 0.200 <0.100
Alhambra Drive(East Davis) Hardness (CaCO3) milligrams per liter 63 63 74 66 65 72 56 65 66 54 75 84
grains per gallons 3.68 3.68 4.33 3.86 3.80 4.21 3.27 3.80 3.86 3.16 4.39 4.91
Boron milligrams per liter <0.100 0.450 0.340 0.360 0.220 0.350 0.140 0.190 <0.100
 <0.100
 0.360 <0.100

  *grains per gallon is calculated by dividing the milligrams per liter result by 17.1

2024 Water Hardness and Boron Test Results

2024
  Location  Analyte  Units Jan Feb Mar  Apr May Jun Jul  Aug Sep Oct Nov  Dec Annual Average 
Whaleback Park (West Davis) Hardness (CaCO3) milligrams per liter 85 62 57 65 64   73  63  89 68   84  120  120  79
grains per gallon  4.97 3.63 3.33 3.80  3.74 4.27   3.68  5.20 3.98   4.91  7.02  7.02  5.0
Boron milligrams per liter <0.050 <0.050 <0.050 <0.050  0.150  0.200  0.130 0.620   0.340  0.470 0.650  0.620  0.398 
Mockingbird Place (North Davis) Hardness (CaCO3) milligrams per liter 85 62 58 64  74 75   77  85 77   84  95  88  77
grains per gallon 4.97 3.63 3.39 3.74  4.33  4.39  4.50 4.97  4.50   4.91  5.56  5.15  4.5
Boron milligrams per liter  <0.050 <0.050 <0.050 <0.050   0.200  0.200  0.250  0.300  0.350 0.430   0.510  0.390  0.329
El Macero Drive (South Davis) Hardness (CaCO3) milligrams per liter 88 63 57  64 45   55  53 61   71  59 61   81  63
grains per gallon  5.15 3.68 3.33  3.74  2.63  3.22  3.10  3.57  4.15  3.45  3.57  4.74  3.7
Boron milligrams per liter  <0.050 <0.050 <0.050  <0.050  <0.050 <0.050  <0.050   0.300  0.300  0.550 0.510   0.250  0.382
1st Street (Central Davis) Hardness (CaCO3) milligrams per liter 83 63 59 66   55  59  54  79  72  60 89   89 69 
grains per gallon  4.85 3.68 3.45  3.86  3.22  3.45  3.16  4.62 4.21   3.51  5.20  5.20  4.0
Boron milligrams per liter <0.050 <0.050 <0.050 <0.050   0.120  0.100  <0.050  0.290  0.310 0.130   0.490  0.130  0.224
Alhambra Drive (East Davis)  Hardness (CaCO3)  milligrams per liter  89  61  59  67  110  54  54  95 69  55   65  84  72
 grains per gallons  5.20  3.57  3.45  3.92  6.43  3.16  3.16 5.56   4.04  3.22  3.80  4.91 4.2 
 Boron  milligrams per liter  <0.050  <0.050  <0.050  0.140 0.180   <0.050  <0.050  0.440  0.290  0.100  0.140 0.200   0.213

 *grains per gallon is calculated by dividing the milligrams per liter result by 17.1 

After treatment at the Regional Water Treatment Facility in Woodland, the finished surface water is dosed with phosphoric acid to create ortho-phosphate for corrosion control. The target residual is 2.5 milligrams per liter prior to entering the transmission line.