Municipal Affairs and Environment

Groundwater Quality Data

About 5% of all drilled water wells are sampled to obtain a representative picture of groundwater quality in the Province. Water wells are sampled during routine inspections of new wells. Sampled well locations are selected to represent all areas of the province. Water sampling done for investigations purposes are not included in this table.

Summary of Groundwater Quality Data Collected to Date (97/12/31)
Parameter #
Samples
Collected
Minimum Maximum Mean Median GCDWQ* Units
Acidity 1 1.50 1.50 1.50 1.50 mg/L CaCO3
Alkalinity 486 0.50 392 103 90.2 30 - 500** mg/L CaCO3
Aluminum 102 <0.001 4.84 0.115 0.050 0.05 - 0.1** mg/L Al
Ammonia 223 <0.001 1.40 0.045 0.020 0.5** mg/L N
Antimony 83 <0.00001 0.053 0.0044 0.00100 0.006** mg/L Sb
Arsenic 102 <0.0001 0.045 0.0054 0.0050 0.025 mg/L As
Barium 96 0.003 0.72 0.20 0.053 1.0 mg/L Ba
Beryllium 3 0.005 0.005 0.005 0.005 mg/L Be
Biccarbonate 5 84.2 200 135 113 mg/L HCO3
Boron 83 <0.001 0.20 0.088 0.050 5.0 mg/L B
Bromide 9 0.100 12.1 1.75 0.138 mg/L Br
Cadmium 188 <0.000001 0.010 0.0013 0.00050 0.005 mg/L Cd
Calcium 497 0.01 503 33.9 23.0 mg/L Ca
Carbonate 4 0.40 1.0 0.80 0.90 mg/L CO3
Chemical Oxygen Demand 19 3 42 16.9 14.0 mg/L COD
Chloride 484 1.89 5870 77.2 22.0 <=250 mg/L Cl
Chromium 88 <0.0001 0.02 0.0045 0.0050 0.05 mg/L Cr
Cobalt 1 0.005 0.005 0.005 0.005 mg/L Co
Colour (aparent / true) 385 2 260 20.5 6.0 <=15 TCU
Conductance 426 28.8 18556 530 279 micromhos/cm
Copper 252 <0.001 1.52 0.025 0.010 <=1 mg/L Cu
Dissolved Organic Carbon 53 <0.01 12.6 1.89 1.10 mg/L C
Fluoride 421 0.010 5.16 0.25 0.10 1.5 mg/L F
Hardness 488 0.1 5228 131 78.1 mg/L CaCO3
Iron 476 <0.001 32 0.70 0.070 <=0.3 mg/L Fe
Kjeldahl Nitrogen 49 0.01 2 0.14 0.05 mg/L N
Lead 121 <0.0001 0.12 0.0068 0.0010 0.01 mg/L Pb
Magnesium 497 0.010 1181 10.8 4.30 150** mg/L Mg
Manganese 466 <0.001 7.30 0.26 0.030 <=0.05 mg/L Mn
Mercury 11 0.0002 0.0005 0.0003 0.0003 0.001 mg/L Hg
Nickel 86 <0.001 0.030 0.008 0.005 mg/L Ni
Nitrate 87 0.002 2.88 0.31 0.089 45 mg/L N
Nitrate + Nitrite 429 <0.001 6.70 0.38 0.050 10** mg/L N
Nitrite 325 <0.001 0.61 0.015 0.001 1.0 mg/L N
Ortho Phosphorus 97 0.01 0.57 0.03 0.02 mg/L PO4
pH 453 5.19 9.77 7.58 7.69 6.5 - 8.5 Units
Phosphorus 72 0.001 0.20 0.018 0.005 0.2** mg/L PO4
Potassium 457 0.010 41.0 2.29 1.07 mg/L K
Selenium 7 0.001 0.10 0.03 0.01 0.01 mg/L Se
Silica 5 5.9 12.1 9.2 9.0 mg/L SiO2
Silicate 6 2.7 6.9 5.0 5.2 mg/L Si
Silver 2 0.005 0.005 0.005 0.005 0.05** mg/L Ag
Sodium 464 0.02 3042 61.6 19.0 <=200 mg/L N
Sulfate 454 0.10 1750 30.3 9.69 <=500 mg/L SO4
Sulfide 100 0.001 2.30 0.052 0.010 0.05 mg/L S
Thallium 55 <0.0001 0.0011 0.0008 0.0010 mg/L T
Tin 3 0.01 0.03 0.02 0.03 mg/L Sn
Total Dissolved Solids 453 10 13300 371 180 <=500 mg/L
Total Organic Carbon 125 0.5 22.4 1.6 1.0 mg/L C
Total Phosphorus 342 0.002 2.30 0.057 0.020 mg/L PO4
Total Solids 3 100 240 157 130 mg/L
Total Suspended Solids 168 <0.1 294 7.4 4.0 mg/L
Turbidity 210 0.01 1770 12.9 0.70 1;<= 5 NTU
Uranium 7 0.001 0.010 0.006 0.005 0.02 mg/L U
Vanadium 3 0.01 0.05 0.02 0.01 mg/L V
Zinc 434 <0.001 136 0.40 0.010 <=5 mg/L Zn
* Health Canada, Guidelines for Canadian Drinking Water Quality (1996) opens new window
** US Environmental Protection Agency, or other agency
 
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