Prince Edward Island · rules and data checked October 8, 2026

Home health check for Charlottetown

In Health Canada's 2012 survey, 3.5% of 113 homes tested in the Prince Edward Island region were above the 200 Bq/m³ radon guideline. Charlottetown's January averages −7.7 °C (ECCC), with about 55 nights a year below −10 °C, when CMHC advises keeping indoor humidity near 30% to stop window condensation. Prince Edward Island has no rule we could confirm for carbon monoxide alarms in existing houses.

Radon, 2012 survey

3.5%

above 200 Bq/m³ (113 homes)

Radon, 2024 survey

—

no figure for this area

January average

−7.7 °C

55 nights a year below −10 °C

Private wells

Rare

in Charlottetown

Home health check for Charlottetown

Four quick checks, set up with Charlottetown's winter temperatures and Prince Edward Island's alarm rules. Change any value; nothing you enter leaves your browser.

Radon test result

Example value: the Health Canada guideline. Replace it with your own result from a test of at least 3 months.

200Bq/m³ (5.4 pCi/L)

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

At the guideline. Health Canada's guideline is 200 Bq/m³; it advises keeping radon as low as reasonably achievable, so consider retesting in the heating season.

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 Charlottetown.

53%highest humidity before the glass fogs at −7.7 °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 −7.7 °C. It is about 11.1 °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%; Charlottetown averages 55 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
Not confirmed for this province
Smoke alarms for full coverage (new-home standard)
6
CO alarms recommended
2

We couldn't confirm a Prince Edward Island rule for existing houses; install them anyway.

“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.

Charlottetown at a glance

Radon surveys covering Charlottetown
SurveyResult
Health Canada, 2012Prince Edward Island, 113 homes, long-term tests3.5% above 200 Bq/m³; 0.0% above 600

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 −7.7 °CAt −19.3 °C
Single glazing with a storm windowU 2.952%40%
Double glazing, clear (1970s–1990s)U 2.8653%40%
Double glazing, low-e and argon (2000s)U 1.867%57%
ENERGY STAR (U 1.22 or better)U 1.2276%68%
Triple glazingU 1.473%65%

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 Charlottetown sees on about 55 nights a year.

Smoke alarms in Prince Edward Island

Not confirmed. The Fire Safety Act (consolidated to 2026-05-29) requires everyone to comply with codes adopted by regulation, but the regulation adopting a fire code could not be located. The Fire Marshal's page advises smoke detectors 'on every floor, as well as every sleeping room' (advice).

Existing homes must have them: Not confirmed · Every storey: Not confirmed · In each bedroom: Not confirmed · Interconnected: Not confirmed

Official source ↗

Carbon monoxide alarms in Prince Edward Island

No provincial requirement to install CO alarms in existing homes was found. PEI's Fire Safety Act (consolidated to 2026-05-29) lists CO alarms under 'fire detection system' but does not itself require them in dwellings. The Fire Marshal's prevention page advises, without making it mandatory, that 'CO alarms should be installed outside each sleeping area and on every level of the home'. The older Fire Prevention Act (current to 2023-03-04) has no CO provision.

Regulations adopting fire or building codes under the Fire Safety Act could not be located (princeedwardisland.ca blocks automated access to some legislation files). Left null.

Official source ↗

Well water in Charlottetown

Charlottetown is served by the City's water and sewer utility, so private wells are uncommon.

  • Bacteria: At least once a year (Free for residential wells)
  • Chemistry: When drilled and every 2 years after (Free for residential wells)

Prince Edward Island source 1 ↗

Radon help in Prince Edward Island

New homes: Yes. PEI adopted the NBC 2020 (Energy Tier 1) effective Mar 31, 2024 under the Building Codes Act regulations; province-wide NBC adoption dates from 2020. The province's radon page says new homes must include a vapour barrier to reduce radon entry and a rough-in for a radon reduction system.

Test kits: The PEI government radon page (updated July 23, 2026) says kits can be borrowed through the Provincial Library Service (LungNSPEI library loan program) or ordered from LungNSPEI. No free provincial kit giveaway was found.

Other help: PEI points residents to the Canadian Lung Association (Lungs Matter, up to $1,500; PEI income cap $80,600) for mitigation funding. Contact: Environmental Health, 902-368-4970.

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

Common questions in Charlottetown

How common is radon in Charlottetown?

Health Canada's 2012 survey found 3.5% of 113 homes tested in the Prince Edward Island region at or above 200 Bq/m³. 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 Charlottetown?

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). Charlottetown averages 55 nights a year below −10 °C. At the January average of −7.7 °C, clear double-glazed windows start to fog at about 53% humidity at the centre of the glass, and at about 40% in a cold snap of −19.3 °C; the edges fog sooner.

How many smoke alarms does a house need in Prince Edward Island?

Not confirmed. The Fire Safety Act (consolidated to 2026-05-29) requires everyone to comply with codes adopted by regulation, but the regulation adopting a fire code could not be located. The Fire Marshal's page advises smoke detectors 'on every floor, as well as every sleeping room' (advice). 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 Prince Edward Island?

No provincial requirement to install CO alarms in existing homes was found. PEI's Fire Safety Act (consolidated to 2026-05-29) lists CO alarms under 'fire detection system' but does not itself require them in dwellings. The Fire Marshal's prevention page advises, without making it mandatory, that 'CO alarms should be installed outside each sleeping area and on every level of the home'. The older Fire Prevention Act (current to 2023-03-04) has no CO provision.

How often should I test my well water in Prince Edward Island?

Bacteria: At least once a year. Chemistry: When drilled and every 2 years after. Bacteria test cost: Free for residential wells. Charlottetown is served by the City's water and sewer utility, so private wells are uncommon.

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 Charlottetown

Heating and hot water costs in CharlottetownWhat heating, hot water and air conditioning cost at your local prices, and what each heating system would cost instead.Upgrade payback in CharlottetownSavings, rebates and payback for attic, wall and basement insulation, windows, air sealing and thermostat setbacks.Appliance running costs in CharlottetownWhat 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 Charlottetown Radon testing in CharlottetownCarbon monoxide testing in CharlottetownWell water testing in CharlottetownMould testing in CharlottetownVentilation assessments in Charlottetown Prince Edward Island rebates and programs

Sources

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

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