Boulder CO Water Restrictions 2026
Published: Updated:
Boulder County· Colorado
As of May 1, 2026, Boulder remains in Drought Watch — the city has not escalated to mandatory restrictions. The May 1 snowpack and reservoir evaluation did not trigger mandatory Stage 1 restrictions. Boulder’s Projected Storage Index (PSI) as of April 20 supported remaining at Drought Watch. The 10 AM–6 PM sprinkler blackout is now in effect (May 1 through September 30) and applies regardless of drought stage. Drought pricing of $1.10 per 1,000 gallons surcharge has started. This page covers Boulder’s current Drought Watch status, the active May–September outdoor watering window, and what residents should do.
Current Status
As of May 1, 2026, Boulder remains in Drought Watch — the city has not escalated to mandatory restrictions. The May 1 snowpack and reservoir evaluation did not trigger mandatory Stage 1 restrictions. Boulder’s Projected Storage Index (PSI) as of April 20 supported remaining at Drought Watch. The 10 AM–6 PM sprinkler blackout is now in effect (May 1 through September 30). Drought pricing of $1.10 per 1,000 gallons surcharge has started. The city recommends leaving irrigation systems off until mid-to-late May. Snowpack in Boulder’s key watersheds is at 25–32% of normal — historically low, comparable to 1981, 2002, and 2012. CBT allocation is 80% (above the standard 70%), providing a buffer. Next evaluation point: early June if conditions worsen. Monitor bouldercolorado.gov/services/drought-watch-program.
Watering Schedule by Address
There is no mandatory address-based schedule. The recommended best practices below are voluntary; the 10 a.m. – 6 p.m. blackout is mandatory under Boulder ordinance from May 1 through September 30.
| Group | Watering Days |
|---|---|
| All addresses (voluntary) | Maximum 2-3 days per week |
| May 1 – Sept 30 outdoor code | No sprinklers 10 a.m. – 6 p.m. |
| Suggested odd/even pattern | Voluntary — odd: Mon/Wed/Fri, even: Tue/Thu/Sat |
Boulder’s 10 a.m. – 6 p.m. sprinkler blackout is now in effect (May 1 through September 30) regardless of drought stage. The voluntary 2-3 days per week guidance is in addition to the seasonal rule and should be followed to avoid escalation in early June. Drought pricing of $1.10 per 1,000 gallons surcharge has started — high-volume outdoor use is now noticeably more expensive on the bill.
What’s Restricted Beyond Lawn Watering
Boulder’s xeriscape-friendly culture means many residents are already operating well within drought-appropriate water budgets. The city offers extensive resources on drought-tolerant landscaping, native plant selection, and turf alternatives through bouldercolorado.gov. Boulder’s Drought Watch Program (online at the same address) lets residents track watershed conditions in near-real-time and see the same data city water managers use to make decisions. Hand watering and drip irrigation remain permitted any day regardless of the drought response stage.
Fines and Enforcement
There are no mandatory drought fines — Boulder remains in Drought Watch (voluntary) as of May 1, 2026. The seasonal 10 a.m. – 6 p.m. sprinkler blackout (May 1 – September 30) is enforceable as a city ordinance with the standard procedure: warnings first, then fines, then potential water service restrictions for repeat violations. Drought pricing of $1.10 per 1,000 gallons surcharge has also started for outdoor use.
HOA Protection in Boulder
Colorado law (HB 21-1229) prohibits HOAs from requiring water-intensive landscaping, mandating cool-season turf, or penalizing homeowners for xeriscaping or drought-tolerant landscaping. The statute goes further than most US states by actively protecting homeowners who convert their lawns to drought-tolerant alternatives, even outside of declared drought periods. Combined with the City of Denver's public statement that brown lawns are expected during active restrictions, any HOA fine threatened against a brown lawn caused by following local restrictions is on weak legal ground. Keep a copy of your utility's restriction notice and the relevant city ordinance to share with your HOA board if a violation notice arrives.
Lawn Survival Guide for Boulder
Boulder lawns are mostly Kentucky Bluegrass with significant adoption of Tall Fescue and Buffalo Grass thanks to the city’s strong xeriscape culture. KBG goes brown under any restriction — this is dormancy, not death. The crown survives and the lawn recovers when normal water returns. Boulder residents who have already converted portions of their lawns to Buffalo Grass or Blue Grama need a fraction of the water of KBG and tolerate restrictions much better.
- No sprinklers 10 a.m. – 6 p.m. is now in effect (May 1 – September 30) — enforce on your controller today.
- Leave irrigation systems off until mid-to-late May 2026 — the city recommends letting residual snowmelt soak in first.
- Voluntary 2-3 days per week is the current guidance — follow it now to avoid escalation in early June.
- Drought pricing of $1.10 per 1,000 gallons surcharge has started — high outdoor use is now noticeably more expensive.
- Consider Buffalo Grass or Blue Grama for any new planting — both natives need a quarter of the water KBG demands.
- Boulder’s xeriscape culture means lawn alternatives are widely accepted by HOAs — a good time to convert.
Will Restrictions Get Worse?
Boulder’s next drought decision point is early June 2026 if conditions worsen. The May 1 evaluation kept the city in Drought Watch rather than escalating to mandatory Stage 1, supported by an above-normal CBT allocation (80% vs the standard 70%) buffering the 25–32% snowpack deficit. If reservoirs draw down faster than expected through May, an early-June escalation to mandatory 2-day-per-week restrictions is on the table. Boulder residents should program controllers to comply with the 10 a.m. – 6 p.m. blackout and run sprinklers no more than 2-3 days per week as voluntary insurance against escalation.
FAQs — Boulder Water Restrictions 2026
Does Boulder have water restrictions in 2026?
Why is Boulder different from Denver Water cities?
When will Boulder make its next drought decision?
Is the 10 a.m. – 6 p.m. sprinkler ban new with the 2026 drought?
Can my Boulder HOA fine me for replacing my lawn with xeriscape?
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