Nova Scotia · rules and data checked October 8, 2026

Home health check for Halifax

In Health Canada's 2012 survey, 13.6% of 103 homes tested in the Zone 6 region were above the 200 Bq/m³ radon guideline; the 2024 Cross-Canada survey found 38.7% (1 in 3) of houses at or above 200 Bq/m³ for Halifax, NS. Halifax's January averages −4.6 °C (ECCC), with about 37 nights a year below −10 °C, when CMHC advises keeping indoor humidity near 30% to stop window condensation. Nova Scotia does not require carbon monoxide alarms in existing houses.

Radon, 2012 survey

13.6%

above 200 Bq/m³ (103 homes)

Radon, 2024 survey

38.7%

Halifax, NS

January average

−4.6 °C

37 nights a year below −10 °C

Private wells

Common

in Halifax

Home health check for Halifax

Four quick checks, set up with Halifax's winter temperatures and Nova Scotia's alarm rules. Change any value; nothing you enter leaves your browser.

Radon test result

Pre-filled with the 2024 Cross-Canada survey's average (geometric mean) for Halifax, NS. Replace it with your own result from a test of at least 3 months.

135Bq/m³ (3.6 pCi/L)

Scale to 800 Bq/m³. 1 pCi/L = 37 Bq/m³.

Below the guideline of 200 Bq/m³. No action is required. Health Canada still advises keeping radon as low as reasonably achievable, and retesting after major renovations or changes to the basement.

Health Canada's lifetime lung cancer risk: for a never-smoker about 1% at low radon, 2% after lifetime exposure at 200 Bq/m³ and 5% at 800; for a smoker 12%, 17% and 30%. Only a test of 3 months or longer gives an annual average; short tests can mislead.

Winter humidity and window condensation
°C
%
Outdoor temperature

January average: ECCC 1981–2010 normals. Cold snap: NRCan's HOT2000 winter design temperature for Halifax.

57%highest humidity before the glass fogs at −4.6 °C

Double glazing, clear (1970s–1990s) (U 2.86): condensation starts at about −20.1 °C outside with 40% humidity inside.

The centre of the glass stays dry at −4.6 °C. It is about 12.2 °C, above the 6.9 °C dew point. The bottom edge and frame run colder, so condensation can start there first.

Health Canada and CMHC: keep indoor humidity between 30% and 50%. Below −10 °C outside, CMHC advises about 30%; Halifax averages 37 nights a year that cold.

Smoke and carbon monoxide alarms

A sleeping area is a group of bedrooms off one hallway.

Smoke alarms required by law
1
Smoke alarms for full coverage (new-home standard)
6
CO alarms recommended
2

Not required by Nova Scotia law in an existing house, but strongly recommended.

“Full coverage” follows the National Building Code for new homes: one on every storey including the basement, one in each bedroom and one outside each sleeping area, interconnected. CO: NRCan advises one near the furnace or other fuel-burning appliance and one in each bedroom area.

Mould: clean it yourself or call a pro?

Example values shown. 1 m² is about 10.8 sq ft.

Small: you can clean it yourself if you are healthy.

Up to three patches, each under 1 m²: clean with water and unscented dish detergent, wearing safety glasses, an N95 mask and rubber gloves (CMHC). People at risk from mould should not clean it.

Fix the moisture source first. Testing for mould types is usually unnecessary (Health Canada). You entered 2 patches, the largest about 0.5 m².

Halifax at a glance

Radon surveys covering Halifax
SurveyResult
Health Canada, 2012Zone 6, 103 homes, long-term tests13.6% above 200 Bq/m³; 1.9% above 600
Cross-Canada survey, 2024Halifax, NS (Halifax CMA)38.7% (1 in 3) of houses at or above 200 Bq/m³; weighted geometric mean 134.8 Bq/m³ (unweighted 135.7); approx. 2,500+ properties with data.

The 2024 survey pools long-term tests that households volunteered, so it is not a random sample, and more tests were in basements than in 2012. Health Canada's guideline: fix a home above 200 Bq/m³ within a year. Test kits cost about $30–$80 including the lab; mitigation about $2,000–$3,000.

Highest indoor humidity before windows fog (21 °C inside)
WindowAt −4.6 °CAt −15.9 °C
Single glazing with a storm windowU 2.956%43%
Double glazing, clear (1970s–1990s)U 2.8657%44%
Double glazing, low-e and argon (2000s)U 1.870%60%
ENERGY STAR (U 1.22 or better)U 1.2279%71%
Triple glazingU 1.476%67%

Centre of the glass, from the National Building Code's indoor air film and the Magnus dew point formula. January average from ECCC normals; the cold-snap column is NRCan's winter design temperature. Window edges fog sooner, so follow CMHC: about 30% humidity below −10 °C, which Halifax sees on about 37 nights a year.

Smoke alarms in Nova Scotia

The Fire Safety Regulations adopt the NFC 2020 as the Nova Scotia Fire Code (s. 27) with no change to 2.1.3.3, so the NFC rule applies to houses. The stricter rule in the regulations' Part 8 (alarms on every storey and in every sleeping room, interconnected) applies only to retrofits of boarding, lodging and rooming houses.

Existing homes must have them: Yes · Every storey: Not confirmed · In each bedroom: No · Interconnected: No

Law: Fire Safety Regulations, N.S. Reg. 48/2003, as amended to N.S. Reg. 60/2025 (effective 2025-04-01), s. 27

Official source ↗

Carbon monoxide alarms in Nova Scotia

A Nova Scotia government CO document (December 2024) says the Building Code Regulations (which reference the National Building Code) require a CO alarm in a residential or care occupancy building that has a fuel-burning appliance or storage garage. It also says 'older buildings do not need to be retrofitted' when a new Code is adopted unless a Building Official or Fire Inspector requires more equipment because of unsafe conditions. The Fire Safety Regulations require CO alarms to be inspected, tested and maintained per the manufacturer's instructions. The same document says building owners 'should' install CO monitors in all buildings with fuel-burning equipment, which is a recommendation, not a requirement. Nova Scotia adopted the National Fire Code 2020 effective 2025-04-01.

Official source ↗

Well water in Halifax

About one in five HRM residents (roughly 84,000 people) were on private wells in a 2017 provincial estimate, the largest number of private-well users of any Nova Scotia county.

  • Bacteria: At least every year ($34.50 total coliform/E. coli presence-absence; $46.00 MPN count)
  • Chemistry: Every five years (Package A (arsenic, uranium) $37.63; B (adds lead, nitrate/nitrite, fluoride) $59.10; C (31 parameters) $120.67; D (C plus chloride and sulphate) $138.77. Halifax area/West Hants combined with bacteria: A $72.13, B $93.60, C $162.29, D $198.49.)

Nova Scotia source 1 ↗ Nova Scotia source 2 ↗

Radon help in Nova Scotia

New homes: Yes. The Nova Scotia Building Code Regulations (N.S. Reg. 198/2024) adopt the NBC 2020, effective Apr 1, 2025. They make no Nova Scotia amendment to Subsection 9.13.4, so the soil-gas barrier and the radon rough-in for subfloor depressurization apply.

Test kits: LungNSPEI's Radon Reduction Grant Program, a pilot, provides free radon test kits to low-income Nova Scotia households and mitigation grants of up to $2,500. Its Radon Detector Library Loan Program has put 300+ short-term detectors in Nova Scotia and PEI public libraries. Both are listed on LungNSPEI's current site; no end date is given.

Other help: Nova Scotia publishes an interactive Radon Risk Map (provincial map viewer). Lungs Matter mitigation aid (up to $1,500) is available to eligible households (NS income cap $79,900).

Find a C-NRPP certified measurement or mitigation professional at c-nrpp.ca. Data checked October 8, 2026.

Common questions in Halifax

How common is radon in Halifax?

Health Canada's 2012 survey found 13.6% of 103 homes tested in the Zone 6 region at or above 200 Bq/m³. The 2024 Cross-Canada survey, which pools tests that households volunteered, reports 38.7% (1 in 3) of houses at or above 200 Bq/m³ for Halifax, NS. Neighbouring houses can differ a lot, so the only way to know is a long-term test of at least 3 months, ideally in the heating season.

What indoor humidity should I keep in winter in Halifax?

Health Canada and CMHC advise 30% to 50%, and CMHC says to keep it at about 30% when it is below −10 °C outside (as low as 25% in extreme cold). Halifax averages 37 nights a year below −10 °C. At the January average of −4.6 °C, clear double-glazed windows start to fog at about 57% humidity at the centre of the glass, and at about 44% in a cold snap of −15.9 °C; the edges fog sooner.

How many smoke alarms does a house need in Nova Scotia?

The Fire Safety Regulations adopt the NFC 2020 as the Nova Scotia Fire Code (s. 27) with no change to 2.1.3.3, so the NFC rule applies to houses. The stricter rule in the regulations' Part 8 (alarms on every storey and in every sleeping room, interconnected) applies only to retrofits of boarding, lodging and rooming houses. New homes built to the National Building Code need hardwired, interconnected alarms on every storey and in every bedroom, which is the standard we recommend for full coverage.

Are carbon monoxide alarms required in Nova Scotia?

A Nova Scotia government CO document (December 2024) says the Building Code Regulations (which reference the National Building Code) require a CO alarm in a residential or care occupancy building that has a fuel-burning appliance or storage garage. It also says 'older buildings do not need to be retrofitted' when a new Code is adopted unless a Building Official or Fire Inspector requires more equipment because of unsafe conditions. The Fire Safety Regulations require CO alarms to be inspected, tested and maintained per the manufacturer's instructions. Th

How often should I test my well water in Nova Scotia?

Bacteria: At least every year. Chemistry: Every five years. Bacteria test cost: $34.50 total coliform/E. coli presence-absence; $46.00 MPN count. About one in five HRM residents (roughly 84,000 people) were on private wells in a 2017 provincial estimate, the largest number of private-well users of any Nova Scotia county.

How we calculate this

Radon

1 pCi/L = 37 Bq/m³ (Health Canada). The Canadian guideline is 200 Bq/m³; above it Health Canada recommends fixing your home within 1 year, sooner the higher the level. Only a long-term test (at least 3 months, ideally in the heating season) tells you your annual average.

Window condensation

glass temperature = indoor − U × (indoor − outdoor) ÷ 8.33

8.33 W/m²·°C is the indoor air film from the National Building Code (RSI 0.12). The dew point comes from the Magnus formula the US National Weather Service publishes; condensation forms when the glass is colder than the dew point. These are centre-of-glass figures: the bottom edge and metal frames run colder, which is why we show CMHC's simpler rule beside them (30% indoor humidity when it is below −10 °C outside, as low as 25% in extreme cold).

Smoke and CO alarms

“Required by law” applies your province's fire code to the layout you enter. “Recommended” is the new-home standard in the National Building Code (an alarm on every storey, in every bedroom and outside sleeping areas) and NRCan's CO advice (one near the furnace or other fuel-burning appliance and one in each bedroom area). Municipal by-laws can add to provincial rules.

Well water and mould

Testing frequencies and lab fees are the ones your province publishes. Mould size categories are Health Canada's and CMHC's: up to three patches each under 1 m² can be cleaned by a healthy homeowner; more than 3 m² needs a professional.

More for Halifax

Heating and hot water costs in HalifaxWhat heating, hot water and air conditioning cost at your local prices, and what each heating system would cost instead.Upgrade payback in HalifaxSavings, rebates and payback for attic, wall and basement insulation, windows, air sealing and thermostat setbacks.Appliance running costs in HalifaxWhat your fridge, dryer, freezer and other appliances cost to run at your local electricity price, and what a newer model saves.
Build your upgrade plan → All home services in Halifax Radon testing in HalifaxCarbon monoxide testing in HalifaxWell water testing in HalifaxMould testing in HalifaxVentilation assessments in Halifax Nova Scotia rebates and programs

Sources

Prices and programs checked October 8, 2026. Climate: NRCan HOT2000 (Shearwater) for heating and ECCC 1981–2010 normals (Shearwater A) for cooling and temperatures.

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