Longmont CO Water Restrictions 2026
Published:
Boulder County· Colorado
Longmont is at Sustainable Conservation Level — Drought Watch as of April 2026. There are no mandatory watering restrictions. The city strongly advises residents to water no more than twice per week, only before 10 a.m. or after 6 p.m., and to keep automatic sprinklers off until May. A formal decision on mandatory restrictions will be made in April or May 2026 based on St. Vrain Creek runoff data. Longmont is NOT a Denver Water customer — it draws from Ralph Price Reservoir (Button Rock Preserve) via the St. Vrain Creek watershed, a separate source that holds some of the most senior water rights in the South Platte Basin.
Current Status
Longmont is on Drought Watch — no mandatory restrictions are in place as of April 2026. The city recommends voluntary conservation of no more than 2 days per week and strongly advises not turning on automatic sprinkler systems before May. A formal decision is expected in April–May 2026 based on St. Vrain Creek runoff. Longmont’s supply situation is notably stronger than Denver’s: Ralph Price Reservoir was near 79% full in early April — below normal but not at crisis levels — compared to the South Platte Basin at 42% of normal.
Watering Schedule by Address
No mandatory schedule is active. Longmont’s voluntary guidance is maximum 2 days per week, only outside the 10 a.m. – 6 p.m. blackout window. If moderate shortage is declared, expect mandatory 2-day scheduling with tiered pricing.
| Group | Watering Days |
|---|---|
| Voluntary guidance — all addresses | Maximum 2 days per week |
| If moderate shortage declared | Mandatory 2 days per week + tiered pricing |
The 2-day cap and blackout window are advisory in April 2026. Longmont’s senior water rights mean the city’s situation differs meaningfully from Denver’s — but residents should conserve now to protect that advantage if summer conditions worsen.
What’s Restricted Beyond Lawn Watering
Under voluntary Drought Watch, Longmont asks residents to avoid washing cars at home unless using a shut-off hose, postpone pressure washing, and defer new sod until after the April–May decision. Hand watering trees, shrubs, and vegetable gardens is encouraged. Drip irrigation follows the same 2-day advisory as sprinklers but is more water-efficient per session.
Fines and Enforcement
There are no fines under Drought Watch. If Longmont declares a moderate shortage, mandatory conservation programming begins with escalating surcharges. Longmont participates in regional conservation rebate programmes in 2026: Garden in a Box (low-water garden kits), Lawn Replacement (consultations and incentives for turf removal), and Slow the Flow (free sprinkler audits).
HOA Protection in Longmont
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 Longmont
Longmont’s lawns are predominantly Kentucky Bluegrass. KBG lawns brown naturally as temperatures rise — this is dormancy, not death. A fully dormant KBG lawn needs only ½ inch every 14 days to keep crowns alive through summer. The tug test confirms whether your lawn is dormant or dead.
- Keep automatic sprinkler systems off until May — April irrigation in Longmont waters dormant grass and benefits weeds, not lawns.
- Voluntarily limit to 2 days per week even without a mandate — this builds the conservation habit and protects Longmont’s supply advantage if conditions worsen.
- Water before 10 a.m. or after 6 p.m. to minimize evaporation on Colorado’s warm spring days.
- Track daily usage via Longmont’s online customer portal — knowing your baseline helps you hit a 20% cut target easily if mandatory restrictions are declared.
- Apply for the Garden in a Box or Lawn Replacement programmes now — demand is expected to be high this season and funds are limited.
- Kentucky Bluegrass lawns will brown naturally as temperatures rise — this is dormancy, not death. A fully dormant KBG lawn needs only ½ inch every 14 days to keep crowns alive through summer.
Will Restrictions Get Worse?
Longmont’s formal decision for 2026 will be based on April and May runoff from the St. Vrain watershed. If projections come in significantly below average, Longmont could move to a moderate shortage designation with mandatory conservation programming. Any change would be announced immediately through longmontcolorado.gov/water. Longmont’s senior water rights make escalation less likely than in Denver’s system, but not impossible — the snowpack shortfall is unprecedented.
FAQs — Longmont Water Restrictions 2026
Does Longmont have mandatory water restrictions in 2026?
Why doesn’t Longmont have restrictions like Denver?
Could Longmont still declare restrictions in 2026?
Does Longmont offer rebates to replace lawns?
Can my Longmont HOA fine me for a brown lawn?
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