Regional groundwater summary • Ontario Historical Log Extraction
Bottom Line Up Front
In Grey, the median completed well is 104 ft deep.
A published hardness range for this place and aquifer is under 60 to above 180 mg/L as CaCO₃. That is a regional estimate, not a test of your well. Source: Estimate based on Health Canada hardness bands.
Most production draws from Limestone (about 59% of local wells).
These municipal aggregates support planning only — they do not replace an accredited laboratory potability test for your own well.
Interactive Well Depth & Modeled Typical Strata
Drag the indicator line or tap a stratum below to read the recorded depth range
Modelled Depth
104 FT
Area median
Drilling cost
$7,280–$15,600
Estimate
Published hardness
under 60 to above 180 mg/L as CaCO₃
Modeled typical strata — placeholder from median depth + aquifer type; not local driller logs.
Local measurements compared against Ontario provincial benchmarks.
| Hydrogeological Metric | From the registry or a cited study | ON Provincial Benchmark |
|---|---|---|
| Total Registered Wells | 19,444 | — |
| Median Well Depth | 104 ft | 103 ft provincial median |
| Average Well Depth | 114.3 ft | — |
| Dominant Aquifer | Limestone | — |
| Hardness | under 60 to above 180 mg/L as CaCO₃ — Estimate. Estimate based on Health Canada hardness bands | — |
| Drilling cost | $7,280–$15,600 — Estimate. Typical drilling prices in Canada, about $70–$150 per foot | — |
| Domestic Household Use | 86% of wells | — |
Approximate boundary of Grey
Shaded area is an approximate municipal outline for orientation only. Well records are aggregated across the entire Grey.
Most completed wells fall near the median depth of 104 ft. Recorded depths cover 19,370 wells.
Median depth of 104 ft falls inside the reported range. Deeper completions here usually mean higher mineral content but steadier year-round pressure.
Bedrock and drift aquifers recorded by drillers in this area. Recorded for 19,311 of these 19,444 wells.
11,549 of 19,444 Major regional bedrock aquifer formed by Ordovician/Silurian dolomite. Known for reliable, high-volume yields with elevated mineral hardness and dissolved calcium/magnesium carbonates.
4,765 of 19,444 Fractured sedimentary shale formation (including Odanah / Pierre members). Characterized by high total dissolved solids (TDS) and potential sulfur/iron compounds.
2,432 of 19,444 Shallow to intermediate glacial drift aquifer deposited in alluvial channels or outwash plains. Yields softer water but requires continuous sediment filtration and shallow bacterial monitoring.
541 of 19,444 Impermeable glaciolacustrine clay and silt deposits formed in ancient glacial lakes. Acts as an effective regional aquitard confining underlying aquifers.
22 of 19,444 Deep basal sandstone bedrock unit (including Winnipeg Formation). Supplies exceptionally stable yields; often exhibits moderate mineral hardness with silica-rich water.
1 of 19,444 Crystalline Canadian Shield rock. Yields soft, slightly acidic water with minimal dissolved solids, relying on secondary fracture networks for groundwater storage.
1 of 19,444 Unclassified hydrogeological formation from legacy provincial drill records.
3,655 holes found no usable water. test holes, observation or monitoring wells, dewatering wells, decommissioned wells, dry holes, no-aquifer holes, and other non-supply wells filtered out of the headline
A published hardness range, when one exists for this place and aquifer. Not a test of your well.
Measured nearby
Measured government tests within 25 km of Grey.
USGS (2018) bands reprinted by Health Canada. A range can cross more than one band. This is not a sample.
What this is not
Health Canada has not set a maximum acceptable concentration for hardness. A wide published range can sit in more than one USGS band.
EUPHRASIA, GREY COUNTY, 13.84 km away, in the wider area.
18 government lab tests, dated 2003–2025.
Hardness 64–356 mg/L as CaCO₃, median 307.
Worked out by wellwaterguide.ca from 18 government lab tests.
reported hardness, or calculated from measured calcium and magnesium when hardness was not reported
Provincial Groundwater Monitoring Network (PGMN): water chemistry and well locations Open Government Licence - Ontario
SULLIVAN, GREY COUNTY, 15.01 km away, in the wider area.
13 government lab tests, dated 2003–2014.
Hardness 152–340 mg/L as CaCO₃, median 292.
Worked out by wellwaterguide.ca from 13 government lab tests.
reported hardness, or calculated from measured calcium and magnesium when hardness was not reported
Provincial Groundwater Monitoring Network (PGMN): water chemistry and well locations Open Government Licence - Ontario
SULLIVAN, GREY COUNTY, 15.01 km away, in the wider area.
21 government lab tests, dated 2002–2024.
Hardness 211–320 mg/L as CaCO₃, median 271.
Worked out by wellwaterguide.ca from 21 government lab tests.
reported hardness, or calculated from measured calcium and magnesium when hardness was not reported
Provincial Groundwater Monitoring Network (PGMN): water chemistry and well locations Open Government Licence - Ontario
1 well tested, range 248–313 mg/L.
13.9 km away, in the wider area.
Tests dated 2003–2004.
These results are old (tested 2003–2004).
1 well tests above 180 mg/L.
Worked out by wellwaterguide.ca from 2 government lab tests.
reported hardness, or calculated from measured calcium and magnesium when hardness was not reported
Provincial Groundwater Monitoring Network (PGMN): water chemistry and well locations Open Government Licence - Ontario
Historical permit and construction activity by decade.
62% of dated wells are over 30 years old (pre-1995). Steel casing installed before 1995 can lose integrity over time. Any older well should get a casing inspection and a certified bacterial test before reliance.
Treatment
This page does not turn a hardness range or a well depth into an equipment total, a grain capacity, or a drilling price. Read the methodology, the filtration guide, and the products catalog.
Suggested system
Test kit
estimate, confirm with a lab testA test of your own well comes before any equipment. Test for coliform bacteria.
Water testingIron and manganese filter
estimate, confirm with a lab testManganese above the aesthetic objective, consider an iron/manganese filter. One monitoring well near this place has median iron of 0.6 mg/L and median manganese of 0.122 mg/L. Another has median iron of 0.644 mg/L and median manganese of 0.0421 mg/L.
Iron and manganese guideWater softener
estimate, confirm with a lab testA softener is likely needed. The nearest monitoring well has a median hardness of 307 mg/L as CaCO₃.
Hard-water guideBecause water wells in Grey average 104 ft into limestone, contractors equipped with heavy rotary rigs and proper casing seals are recommended. Contact local drillers directly or request competitive bids.
Yard: Barrie, ON (84.7 km away)
Yard: Waterloo, ON (100.1 km away)
Yard: Stratford, ON (113.4 km away)
Yard: Arva, ON (151.9 km away)
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Quick answers about water wells in Grey.
Among 19370 producing water wells with a recorded depth, the median is 104.0 ft (31.7 m).
Explore neighbouring hydrogeological formations and compare drilling depths