Denver Water Drought Stages Explained: Stage 1, 2, and 3

Why There Are Stages

Denver Water manages a multi-reservoir system fed by two mountain basins: the Colorado River Basin and the South Platte River Basin. When snowpack is normal, those basins refill reservoirs through spring snowmelt, and the system can handle summer demand without restrictions. When snowpack fails — as it dramatically did in 2026, finishing as the worst on record since 1941 — there isn't enough melt coming to rebuild reservoir storage through the summer. That's when mandatory stages kick in.

The stage system gives Denver Water a structured response framework. Each stage triggers progressively stricter restrictions and targets a specific reduction in overall water use. The goal is to protect reservoir levels not just for the current summer but for the following year — because if reservoirs drain too far in a drought year and the next winter is also dry, the system can reach critically low levels. Denver Water projected that without at least Stage 1 restrictions, its reservoirs would fall to 57% of capacity by 2027. With Stage 1 compliance, that number improves significantly.

Denver Water has three mandatory stages. Some neighboring utilities that buy from Denver Water — like Arvada — use the same stage framework. Note: Stage 4 is not a Denver Water designation. Erie, which hit a Water Supply Shortage Response Level 4 Emergency in spring 2026, uses its own scale. Erie's Level 4 means a complete sprinkler shutdown due to an infrastructure-level shortage, not the same system as Denver Water's stage framework.

Stage 1: Mandatory Restrictions in Effect Now

Target reduction: 20% of total water use. This is where Denver Water is right now, declared March 25, 2026. Stage 1 is the first of three mandatory levels and brings the broadest set of customers under structured restrictions for the first time.

Outdoor watering is limited to two assigned days per week. Single-family residential customers water on assigned days based on address: even-numbered addresses on Sundays and Thursdays, odd-numbered addresses on Wednesdays and Saturdays. All other customers — multifamily, commercial, HOAs, government properties — water only on Tuesdays and Fridays.

Watering hours are restricted. Outdoor watering is only allowed before 10 a.m. or after 6 p.m., every day of the year regardless of drought stage. This rule is permanent under Denver Water's outdoor use rules, but it matters more now because every violation during a drought year has a greater impact.

Sprinkler systems should stay off until mid-to-late May. Denver Water is specifically asking customers not to activate automatic irrigation systems until at least mid-May 2026, and ideally not until June if conditions allow. April and early May irrigation is unnecessary — soil still holds winter moisture, roots are barely out of dormancy, and there's meaningful freeze risk. Early startup wastes water and increases the drain on reservoirs during the critical spring window.

Restaurants serve water by request only. Under Stage 1, Denver restaurants are required to serve water to customers only when requested rather than automatically with every table setting. A small measure, but part of the system-wide 20% goal.

Enforcement: First violation is a warning. Second violation is $250. Third violation is $500. Denver Water has said its approach is education-focused but repeat violations will be enforced.

Surcharges: Drought pricing is coming. Denver Water brings its surcharge proposal to the board April 8. Surcharges will apply to higher-volume outdoor use. Indoor water use — drinking, cooking, bathing — stays at base pricing. Once approved, surcharges take effect May 1, 2026.

Stage 2: Severe Drought

Target reduction: approximately 35%. Stage 2 means the supply situation has gotten significantly worse — reservoir levels are declining faster than projected under Stage 1, or a second dry winter is compounding the deficit. Landscape damage is described as a likely consequence of Stage 2 restrictions, which gives you a sense of how much more restrictive they are.

Outdoor watering drops to one day per week on the same address-based schedule. The transition from two days to one day per week is where Kentucky bluegrass lawns start to genuinely struggle. Most turf needs 1 to 1.5 inches of water per week in summer, and one day per week typically can't deliver that even with extended run times.

Trees and shrubs are restricted to once a week on the assigned day, using a handheld hose or drip irrigation only — not spray heads. This matters because trees and established shrubs need water through drought to survive; losing a mature tree to drought stress is a years-long process but a real risk under Stage 2 summer conditions.

New plantings are prohibited. No new grass, sod, trees, shrubs, flowers, or vegetables may be planted during Stage 2. This prevents the high water demand of establishment irrigation during a supply crisis.

Residential pools cannot be filled or refilled. Community and commercial pools may continue operating, but single-family residential pool filling is prohibited.

Vegetable gardens may be watered with a handheld hose or drip irrigation, but not with spray heads. Timing restrictions (before 10 a.m. or after 6 p.m.) still apply.

Stage 3: Emergency Rationing

Target reduction: approximately 50%. Stage 3 is described by Denver Water and Arvada as unlikely — a worst-case scenario that would require conditions to deteriorate significantly beyond where they are today. The 2026 drought is serious, but reservoirs are still at 80% of capacity as of late March. Stage 3 would typically be triggered by reservoir levels falling to critically low thresholds combined with no near-term recovery projected.

All Stage 1 and 2 restrictions apply, to a stricter degree. Outdoor watering may be reduced to no more than once a week or in some frameworks completely prohibited except for hand watering of trees. The specific rules escalate from Stage 2, meaning the two-days-per-week of Stage 1 that's now in effect would be long gone.

Historical context: Denver Water has declared Stage 1 drought five times since 2000 — in 2002, 2003, 2004, 2013, and now 2026. The utility has never reached Stage 3. Stage 2 was reached during the severe 2002 drought. That context is useful: even in a drought year that went to Stage 2, Stage 3 was not triggered. 2026 is starting from a more severe snowpack position than 2002, but Denver Water's reservoir system is larger and more sophisticated than it was then.

What About Stage 4? (Erie's Level 4)

Several people searching for "Stage 4 water restrictions" are thinking of Erie, Colorado, which hit a Water Supply Shortage Response Level 4 — Emergency in March 2026. Erie's system is different from Denver Water's. Erie's Level 4 was triggered by an infrastructure constraint: water demand spiked nearly 30% above normal for March as temperatures climbed, putting the distribution system at risk of running dry — not because of a reservoir shortage in the same sense. Erie ordered all residential sprinklers off immediately. As of April 2026, Erie's emergency restrictions have eased slightly as seasonal demand normalized.

Erie is not a Denver Water customer and doesn't use Denver Water's three-stage framework. Its own plan uses a Level 1–4 scale with Level 4 being the most severe. If you're a Denver Water customer in the south metro — Denver, Littleton, Lakewood, Arvada, Wheat Ridge, Greenwood Village, and surrounding areas — Denver Water's three-stage framework is what applies to you.

Aurora's Stage System (Different From Denver Water)

Aurora Water is a separate utility with its own drought response framework. Aurora approved Stage 1 restrictions effective April 7, 2026. Aurora's surcharge structure charges $2.15 per 1,000 gallons above 110% of a customer's winter average (December–February baseline). Aurora's restrictions mirror Denver Water's in broad terms — two days per week, assigned by address — but the surcharge calculation method is different. Aurora customers should check Aurora Water's website for their specific watering schedule and surcharge details.

What Triggers a Move to Stage 2?

Denver Water monitors reservoir levels, projected inflows, and overall system demand throughout the irrigation season. If Stage 1 compliance falls short of the 20% reduction target, or if reservoir levels continue declining faster than projected — particularly if summer precipitation is below normal or a second dry winter follows — the board could vote to advance to Stage 2. There's no automatic trigger formula that's publicly specified; it's a board decision based on evolving supply conditions. Denver Water has said it will communicate well in advance if escalation appears likely.