MRD283REV2-Ambient Groundwater Geochemistry
Product Information and GIS Download
Published 2021
Ambient Groundwater Geochemical and Isotopic Data for Southern Ontario, 2007-2019
This digital data release comprises a revision of data collected in the Ambient Groundwater Geochemistry Project, and is an update to the data released in 2015 as Miscellaneous Release-Data 283 Revised. The new release contains data for the 2287 samples published in the 2015 release, comprising samples collected between 2007 and 2014, and an additional 3944 samples from sampling between 2015 and 2019. The 72% increase in samples all come from add-on projects of various kinds within the same study area footprint as the 2015 data. The add-on studies include, among other things, 3 aquifer screening-tool studies carried out in eastern Ontario in co-operation with several municipalities and the South Nation Conservation Authority. These studies, combined with a similar earlier study in 2013, result in an extremely high sample density in a strip of eastern Ontario that borders the Ottawa River, from west Ottawa to Hawkesbury, Ontario. Several other studies, conducted in 2015 and 2019, also result in an increased sample density on the Niagara Peninsula and along the north shore of Lake Erie to Leamington.
The project provides a comprehensive analytical characterization of the inorganic and isotopic chemistry of groundwater across all of southern Ontario, resulting in coverage of an area of approximately 96 000 km2. Parameters tested include dissolved gases, major ions, trace elements, isotopes of water, and field measurements of alkalinity, temperature, pH, redox potential and electrical conductivity. The release includes a report (.pdf), with a brief explanation of the data and quality control methods, as well as precision and accuracy plots for all parameters, as an appendix in the report; single-parameter maps (.tif) for bedrock wells plotted over bedrock geology; single-parameter maps (.tif) for overburden wells plotted over surficial geology; and a Microsoft® Excel® spreadsheet (.xlsx) containing analytical data plus station data that include well depth, type, deepest formation penetrated and other parameters.
Hamilton, S.M. 2021. Ambient groundwater geochemical and isotopic data for southern Ontario, 2007-2019; Ontario Geological Survey, Miscellaneous Release-Data 283 - Revision 2.
The data are available on 1 CD-ROM. $25.00 or can be downloaded free of charge.
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Area of Breathing Wells
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The author would like to thank Ron Hopper of W.D. Hopper and Sons Ltd. for sharing his considerable knowledge of the groundwater conditions in southwestern Ontario.
R. Hopper, personal communication. 2010
Watch the video below to see examples of Breathing Wells in southern Ontario.
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Well Information
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This layer contains information such as Well Depth and other characteristics of the well itself which may include Subcropping unit, Terrain type, Year drilled, Static water level and descriptions.

Well Depth and Construction

Dug/Bored Wells

Bored or Dug Wells

Drilled Wells

Overburden

Overburden Interface (Less than 3m from rock)

Bedrock Interface (Less than 3m into rock)

Bedrock Subcrop Wells

Bedrock Deeper Wells

Static Water Level Depth

Aquifer Information

Field and Aggregate Parameters
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This layer contains information such as temperature, pH and specific conductivity.

Temperature

Specific Conductivity

pH

ORP Uncalibrated

ORP Levelled

Dissolved Inorganic Carbon (DIC)

Dissolved Organic Carbon (DOC)

Total Dissolved Solids (TDS)

Major Parameters and Trace Anions
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This layer contains information about Major Parameters and Trace Anions.

Calcium

Magnesium

Sodium

Potassium

Bicarbonate

Sulphate

Chloride

Bromide

Fluoride

Phosphate

Boron

Iron

Strontium

Silicon

Nitrogen Parameters (as N)
Nitrogen Parameters

Nitrate

Nitrite

Ammonia

Total Kjeldahl Nitrogen

Organic Nitrogen

Dissolved Gases

Dissolved Oxygen (% Saturation)

Hydrogen Sulphide

Methane (L/m3)

Methane (ppmw)

Carbon Dioxide (ppmw)

Trace Metals

Silver

Aluminum

Arsenic

Barium

Cadmium

Cerium

Cobalt

Chromium

Cesium

Copper

Dysprosium

Erbium

Europium

Gadolinium

Hafnium

Mercury

Holmium

Heavy Rare Earth Elements

Light Rare Earth Elements

Iodide

Lanthanum

Lithium

Lutetium

Manganese

Molybdenum

Niobium

Neodymium

Nickel

Lead

Praseodymium

Rubidium

Antimony

Selenium

Samarium

Tin

Tantalum

Terbium

Thorium

Titanium

Thallium

Thulium

Uranium

Vanadium

Tungsten

Yttrium

Ytterbium

Zinc

Zirconium

Isotopic Parameters

d18O in water (0/00 VSMOW)

Dissolved Radon (Bq/L)

Gross Alpha decay (Bq/L)

Gross Beta decay (Bq/L)

Modelled Parameters

Langelier Saturation Index

Calcite

Dolomite

Siderite

Rhodochrosite

Goethite

Fe(OH)3 (amorphous)

Al(OH)3 (amorphous)

Manganite

Gypsum

Celestite

Barite

Melanterite

Pyrite

FeS

Chalcedony

Halite

Fluorite

Hydroxyapatite

Kaolinite