Canada drought levels: what triggers water restrictions in each province

At the end of September 2026, 64% of Canada was classified as Abnormally Dry (D0) or in Moderate (D1) to Severe Drought (D2), including 30% of the country's agricultural landscape, according to the Canadian Drought Monitor run by Agriculture and Agri-Food Canada (AAFC). The September assessment, posted on 9 October, put 83% of British Columbia at D0 or in drought, and 5% of the province at Extreme (D3) or Exceptional (D4) drought. The same report says "water-use restrictions and fish protection orders remain in place in some watersheds" in British Columbia.

The largest restriction coming up is not caused by drought. The City of Calgary announced on 15 October that city-wide Stage 4 outdoor water restrictions start on 4 November 2026 "for approximately four weeks" while the new Bearspaw South Feeder Main is connected. On the same date, the City described its water supply as "healthy for this time of year".

Canada has no national water restriction trigger. Each province runs its own scale, and the scales measure different things. British Columbia's levels describe how rare the dryness is. Ontario's levels come with water-saving targets. Alberta combines drought stages with a risk ranking. Saskatchewan's Water Security Agency works in phases rather than numbered levels. The rules that bind a household are set locally, as Calgary's four stages show.

How this page was put together

Each stage name, threshold and measure is quoted from the body that publishes it, using that body's wording, with the date the source gives. All sources were read on 29 October 2026. Where a source gives no figure, the table says "Not stated" rather than estimating one. Where a source carries no date, the table says so. Nothing has been converted, recalculated or projected, and percentages and percentiles are left exactly as each source prints them. Drought levels, risk rankings and local restriction stages are separate systems. The page does not line them up against each other, because none of the sources does.

This is a summary for general information. It is not legal advice. Whether a restriction applies to a particular property is set by the local bylaw, licence condition or order that covers it, and that document is the rule that binds a water user.

The thresholds, province by province

The national picture: Canadian Drought Monitor

AAFC calls the Canadian Drought Monitor "Canada's official source for the monitoring and reporting of drought nationally". It has led the monthly assessment since 2002, and its maps feed into the North American Drought Monitor. The five classes run from D0 (Abnormally Dry) to D4 (Exceptional Drought). AAFC explains that "an exceptional drought (D4) for example, represents conditions that historically only appear less than two years in one hundred."

The Drought Monitor sets no restrictions. Its role is to provide a common reference point for the provinces. Alberta's Drought Response Plan says its own index "is based off data generated by the Canadian Drought Monitor".

In the September 2026 assessment, AAFC listed the "primary drought concerns" as Interior British Columbia, the Northwest Territories, northern Manitoba, northwestern Ontario, northeastern Quebec and Labrador. Its regional figures for the end of the month were:

• Prairie Region: 39% Abnormally Dry or in Moderate to Severe Drought, including 9% of the region's agricultural landscape. AAFC added that "drought persists northwest of Calgary".
• Central Region (Ontario and Quebec): 82%, including 58% of the agricultural landscape. Parts of southern and central Ontario received "less than 40% of normal September precipitation".

British Columbia: Drought Levels 0 to 5

Who sets them. The B.C. government's drought information page, last updated on 4 June 2026, says the province "uses a six-level classification system to assess drought conditions (Level 0 to Level 5)". The levels "are set by the River Forecast Centre". The method is set out in the British Columbia Drought and Water Scarcity Operations Plan, updated in April 2026 by the Ministry of Water, Land and Resource Stewardship.

The scale. The plan's Figure 4 labels Level 0 "Normal or wetter than normal" and Level 1 "Abnormally dry". Levels 2 to 5 share the label "Increasing dryness and severity of drought". Level 5 is the "highest severity and most rare". The scale was set up in 2021, refined in 2025 and given a new colour palette in 2026. The government says the change was made "to better emphasize its purpose as a source of statistical information, rather than an alert for action".

The thresholds. Table 3 of the plan gives the cut-offs for percentile-based indicators such as precipitation, 7-day streamflow, lake levels and groundwater:

• Level 0: ">30th" percentile
• Level 1: "21st - 30th"
• Level 2: "11th - 20th"
• Level 3: "6th – 10th"
• Level 4: "2nd – 5th"
• Level 5: "< 2nd"

The same table gives standardised index bands (SPI and SPEI) from "≥ -0.49" at Level 0 to "≤ -2.0" at Level 5. Level 3 is printed as "-1.3 to -1.59" and Level 4 as "-1.66 to -1.99", and they are quoted here as printed. Levels are set by "a convergence-of-evidence approach" that combines these indicators with professional judgement.

What a level does not do. The plan is explicit: "Drought levels measure a natural hazard; they are not direct measures of water scarcity, impacts, or response triggers." It adds that they "do not automatically trigger municipal or provincial response actions". Local governments, First Nations and water suppliers "set local stages and bylaws based on their specific supply, storage, demand, infrastructure and risk context."

What the province can do. The plan says regulatory actions under the Water Sustainability Act "are independent of provincial drought or water scarcity levels". It lists three steps:

• Section 93 orders: these can enforce "first-in-time, first-in-right", enforce licence terms or curtail unauthorised use. "Essential household use of up to 250 litres per day per private dwelling must still be allowed."
• Sections 86 and 87: a declaration of significant water shortage, together with critical environmental flow protection orders, where streams have fallen, or risk falling, below a critical environmental flow threshold.
• Section 88: fish population protection orders. The Minister may order curtailment "regardless of the precedence of water rights".

New in 2026. British Columbia is piloting water scarcity levels of low, moderate and high for individual watersheds. Each watershed defines its own levels. The plan says water scarcity levels "do not trigger regulatory actions".

Ontario: Low Water Response Levels 1 to 3

Who declares them. Ontario's Drought page, updated on 15 May 2026, says the Ministry of Natural Resources and conservation authorities "assign one of three warning levels":

• "Level 1 – the potential for water supply problems is identified"
• "Level 2 – minor water supply issues are encountered"
• "Level 3 – supply may no longer meet demand; social and economic impacts are anticipated"

The ministry's Surface Water Monitoring Centre page, updated on 19 January 2026, defines Level 3 as a "high likelihood of drought conditions (does not imply an emergency)". The Drought page adds that local responses "can range from water conservation messaging to water use restrictions".

The thresholds. The figures come from the Ontario Low Water Response document dated May 2001, which the Upper Thames River Conservation Authority hosts. Its Table 4 gives:

• Precipitation: "<80% of average" for Level I, "<60% of average" for Level II and "<40% of average" for Level III. The document tests 3-month and 18-month totals, and also 1-month totals for Levels II and III.
• Streamflow in spring: monthly flow "< 100%", "< 70%" and "< 50% of lowest average summer month flow".
• Streamflow at other times: "< 70%", "< 50%" and "< 30%".

A watershed "can only enter a Level II from an existing confirmed Level I or Level III condition". Ontario Regulation 686/21 now points conservation authorities to the version "dated March 2010". That version could not be retrieved for this page, so the thresholds above are quoted from the 2001 text.

What each level asks for. The 2001 document sets a "target reduction of water use of 10 per cent" at Level I. At Level II, restrictions on non-essential use are brought in "through the municipalities". At Level III, decisions on "implementing water use restriction" are taken with the local Water Response Team. The Grand River Conservation Authority (page undated) summarises the current practice in these terms:

• Level 1: water users "are asked to voluntarily reduce consumption by 10 per cent".
• Level 2: they are asked to "voluntarily reduce consumption by 20 per cent".
• Level 3: "The Water Response Team may ask the province to impose mandatory restrictions on those holding Permits to Take Water."

Current status. Ontario's provincial conditions map could not be read as text for this page. The Toronto and Region Conservation Authority reported "normal status in TRCA watersheds for the period ending September 30, 2026".

Alberta: drought stages, risk rankings and water-sharing agreements

The stages. Alberta Environment and Protected Areas publishes the Alberta Drought Response Plan. Its latest revision, dated 1 April 2025, covers "drought stage updates, drought index inclusion, risk assessment, revised response structure, and updated MOU process for water sharing". Figure 2 of the plan names six stages:

• Stage 0: Adequate Water Supply
• Stage 1: Abnormally Dry
• Stage 2: Moderate Drought
• Stage 3: Severe Drought
• Stage 4: Extreme Drought
• Stage 5: Catastrophic Drought

The stages "are based on precipitation percentiles that generally relate to the statistical return period". The plan gives one example: "A catastrophic drought (S5) for example, represents conditions that historically a 1 in 50-year event." It does not print the percentile cut-offs for the other stages, so the table says "Not stated". The plan also notes that stages "may not follow a linear progression".

The wording on the government site differs. Alberta's current conditions page still carries its August 2026 update. It reported that most major river basins were "at stage 0 (no drought conditions)". It put the Hay River and Buffalo River basin "at stage 2 (minor drought)" and the Red Deer River basin "at stage 1 (insignificant drought)". The same page listed 10 water shortage advisories as of 13 August 2026. These labels are quoted as each source prints them.

Risk, not stage, drives action. The plan says the risk applied to a basin includes "reservoir storage levels, water management advisories, and water supply and demand" as well as the drought stage. Table 1.0 of the plan sets out what happens at each risk ranking:

• Low: routine regulatory and water management activities.
• Medium: "WS MOU processes are implemented or activated where required". WS MOU stands for water-sharing memorandum of understanding.
• High: the Drought Emergency Operations Centre "is activated to effectively manage drought response".
• Extreme: a "Declaration of Emergency under Section 107 Water Act may be considered … when all other options have been exhausted".

Alberta's "What government is doing" page adds that "Alberta has never declared an emergency under the Water Act". It lists three emergency triggers. The first is insufficient water for priority uses, with "human health and safety" at the top.

Water-sharing agreements. In April 2024, major water users in the South Saskatchewan River Basin signed four water-sharing agreements. The province describes them as "the largest water-sharing initiative in Alberta's history". The agreements covered the Red Deer River, the Bow River, the mainstem of the Oldman River and the upper tributaries of the Oldman River, and 38 major water users signed one of them. According to the province's page for licence holders and municipalities:

• The Oldman South Saskatchewan and Southern Tributaries agreements were "activated" on 9 May 2024 and stayed active until 10 October.
• Licence holders who had not signed were sent letters "outlining the specific expectations to match water reductions set out in the relevant water-sharing agreement".
• All four agreements expired at the end of 2024.

The province published a summary report on the agreements in February 2025.

Who restricts households. The same page says municipalities "develop community-wide water shortage response plans which may include voluntary or mandatory water restrictions". Under the Water Act, the province administers "first in time, first in right" through water management orders to junior licence holders.

Calgary: four outdoor water restriction stages

The stages. The City of Calgary's outdoor water restrictions page says "there are four stages of mandatory outdoor water restrictions, based on the severity of the water shortage." The City publishes no numeric trigger. Instead, it says that to inform the decision, "City staff examine reservoir storage, river flows … what our current and projected water demand is in Calgary and amongst other large water users on the Bow River, weather forecasts, and any construction and maintenance that is happening on our infrastructure." Restrictions are always city-wide.

What each stage allows. These are the City's rules for single-family homes and multi-family properties with fewer than 12 units:

• Stage 1: sprinklers or irrigation "2 hours/week", on Tuesday or Saturday for even house numbers and Wednesday or Sunday for odd ones, "before 10 a.m. or after 7 p.m.". Hand-watering of gardens is allowed at any time.
• Stage 2: sprinklers "1 hour/week" on the same days and times.
• Stage 3: no sprinklers. Gardens may still be watered by hose with a spring-loaded nozzle or by hand-held container, but not lawns. No outdoor car washing, and no filling of outdoor pools or hot tubs.
• Stage 4: no outdoor watering, except edible food crops by spring-loaded nozzle or hand-held container. No washing of building surfaces or windows, and no irrigation testing.

Washing sidewalks, driveways or walkways is not allowed at any stage unless health and safety rules require it. Certified water managed sites have their own reduction rules, from "Reduce watering by 10%" for Tier One sites at Stage 1 to no watering at Stage 4. Larger sites had their allowed hours extended "as part of the Water Utility Bylaw updates in April 2026".

From 4 November 2026. The City's Bearspaw South Feeder Main page says Stage 4 violations "may lead to fines starting at $3,000". Its 15 October news release says that while the existing main is shut down, the amount of water that can be distributed "will be significantly reduced to 500 million litres a day". Indoor water conservation is also requested. The release asks Calgarians and "our neighbours in Airdrie, Chestermere, Strathmore and Tsuut’ina Nation" to save water indoors; it does not say the Stage 4 restrictions apply in those communities. Calgary's drought page, dated 15 October 2026, said reservoir storage in the Bow and Elbow watersheds was "at a normal level for this time of year".

Saskatchewan: Water Security Agency

Phases, not levels. The Water Security Agency's Water Shortage Policy page, published on 19 August 2025, describes "a three-phase approach for managing shortage":

1. Pre-response: assessing supply from snowpack and runoff reports, evaluating demand and identifying at-risk areas.
2. Shortage Response: a "Water Shortage Response Committee" is formed, affected stakeholders are notified, and water use may be monitored and reported for compliance.
3. Post-response: recovery, evaluation and improvement.

The policy gives no numeric trigger for moving between phases.

Who gets water first. The WSA's Adaptive Water Use Prioritization Policy, published the same day, sets three priority levels. "Basic Human Needs" (domestic and municipal use) comes first. "Economic Benefits and Growth" (industrial use) is second. "Agricultural" use is third, covering animal welfare, intensive irrigation and non-intensive irrigation. It says priorities may be adjusted in the short term to accommodate emergencies, and that "an availability percentage based on water supply studies will be included in the water rights licence."

Where the policy stands. The WSA's Annual Report for 2024-25 reports these steps:

• A Managing Water Shortage Policy was developed, and "further work is underway to fully develop the processes and procedures needed to support the full implementation of the policy."
• A hydrological drought indicator was completed in early spring 2024.
• The WSA continues to meet with "the 17 communities that were identified as at risk to drought". In 2024-25, plans were completed for Hudson Bay, Cabri and Vanguard.

A local example. The Village of Vanguard Hydrologic Drought Response Plan was prepared by the Saskatchewan Association of Watersheds and the village's Drought Response Committee, and the document carries no date. It sets three levels on the water level in the village's pump well:

• Level 0, Non-Drought Conditions: between 5.0 m and 7.5 m.
• Level 1, Drought Conditions: between 7.5 m and 8.5 m. The village promotes voluntary conservation, limits use to "domestic use only" and shuts off "the tank load facility".
• Level 2, Severe Drought Conditions: below 8.5 m. The community declares severe drought and implements "odd-even watering days".

Sources and methodology

All pages were read on 29 October 2026.

• Agriculture and Agri-Food Canada: Canadian Drought Monitor and the September 2026 Drought Assessment (conditions as of 30 September 2026; page modified 9 October 2026).
• British Columbia:
  • Drought information page (updated 4 June 2026)
  • British Columbia Drought and Water Scarcity Operations Plan (updated April 2026): Table 3, Figure 4, Table 4 and sections 4.1.3, 5.3.1 and 5.3.2
• Ontario:
  • Drought page (updated 15 May 2026)
  • Surface Water Monitoring Centre page (updated 19 January 2026)
  • Ontario Low Water Response (May 2001): Tables 2–4 and the response section
  • O. Reg. 686/21, s. 3
  • Grand River Conservation Authority Low Water Response page (undated)
  • TRCA Ontario Low Water Program page (status for the period ending 30 September 2026)
• Alberta:
  • Alberta Drought Response Plan (revision of 1 April 2025): Figure 2, Table 1.0 and sections 2.3 and 2.4
  • Drought – Current conditions (August 2026 updates)
  • Drought – What government is doing
  • Information for Water Licence holders and municipalities
• City of Calgary:
  • Understanding outdoor water restrictions (bylaw update April 2026)
  • Drought page (current conditions 15 October 2026)
  • Bearspaw South Feeder Main water restrictions page
  • Newsroom release of 15 October 2026
• Saskatchewan:
  • Water Security Agency: Water Shortage Policy and Adaptive Water Use Prioritization Policy (both published 19 August 2025)
  • Water Security Agency: Annual Report 2024-25
  • Village of Vanguard Hydrologic Drought Response Plan (undated)

Not verified for this page:

• The March 2010 version of Ontario Low Water Response
• Alberta's percentile cut-offs for Stages 0 to 4
• Current basin-by-basin drought levels in British Columbia, which the Drought Information Portal shows only as an interactive map

Cite this page: reservoirs.earth, "Canada drought levels: what triggers water restrictions in each province", data as of 29 October 2026, https://reservoirs.earth/the-reservoir/canada-water-restriction-thresholds.

Related: Australia water restriction thresholds · Spain drought water restrictions · India water restriction thresholds · How close is your city to water restrictions? (US) · Where our reservoir data comes from