Commerce City CO Water Restrictions 2026

Current water restrictions in Commerce City, Colorado

Commerce City is under Stage 1 Mandatory restrictions, limiting outdoor watering to 2 days per week through South Adams County Water, the city's water provider and a Denver Water distributor.

South Adams County Water approved a delayed start to the outdoor watering season, pushing it back from April 13 to May 4, 2026. That means outdoor irrigation before May 4 is not permitted under the seasonal schedule, and once watering does begin, residents are limited to two assigned days per week. The Stage 1 designation is mandatory — not voluntary — meaning compliance is required, not suggested.

The restrictions reflect deteriorating water supply conditions along Colorado's Front Range. Denver Water declared a Stage 1 drought on March 25, and South Adams County Water, which receives its supply through Denver Water's distribution network, is operating under the same supply pressures. More than 20 Front Range cities are currently under mandatory schedules, with conditions ranging from Stage 1 to Stage 4 Emergency in some communities.

Practically speaking: a Commerce City resident cannot simply water their garden on a Wednesday morning whenever they feel like it. You must water only on your two assigned days, only outside the 10am–6pm window, and not before May 4, 2026. If your irrigation system runs on a timer set for noon, it is currently violating the restrictions — both the seasonal delay and the prohibited midday hours. Check your assigned days with South Adams County Water and reset your controller before turning anything on.

Watering schedule and allowed days

Rule	Details
Days per week	2
Day assignment	2 assigned days/week based on address; outdoor watering season delayed to May 4, 2026
Allowed hours	Before 10am or after 6pm only
Hand watering	Exempt — requires a shut-off nozzle on the hose
Drip irrigation	Exempt from day restrictions
New sod/seed	Usually a 30-day establishment window — register with South Adams County Water before starting

Under South Adams County Water's Stage 1 schedule, assigned watering days are typically tied to your property address — odd-numbered addresses water on one set of days, even-numbered addresses on another. Contact South Adams County Water directly to confirm which two days apply to your specific address, as day pairings can vary by district zone within the service area.

The 10am–6pm blackout window applies across all property types. Watering during those hours causes excessive evaporation loss — in Commerce City's high-altitude, low-humidity climate, midday evaporation rates can exceed 50 percent of applied water. Sprinkler systems running during the blackout hours are a common source of neighbor complaints and the most easily spotted violation from the street.

Multi-family residential and commercial properties follow the same two-day-per-week limit and the same prohibited hours. If you manage an HOA, apartment complex, or commercial landscaping account, your irrigation contractor must adjust all zone schedules to reflect the May 4 start date and the two-day limit. Trees in Commerce City — including Plains Cottonwood, Bur Oak, and Honeylocust — are better served by slow, deep drip irrigation rather than spray heads, and drip systems are exempt from the day limits, making them a practical priority for established trees during restrictions.

What happens if you violate restrictions in Commerce City?

Offense	Penalty
First violation	Written warning — no fine
Second violation	Monetary fine issued
Subsequent violations	Escalating fines; potential flow restriction device installation

South Adams County Water begins with a written warning on the first confirmed violation, giving residents a chance to correct the problem before fines are assessed. After that, fines apply to each subsequent violation. For persistent violators, the district has authority to install a flow restrictor on the service line — a device that dramatically reduces water pressure to the property and is removed only after the homeowner pays outstanding fines and demonstrates compliance.

Enforcement relies on a combination of field patrol staff, meter data review, and resident complaints submitted through South Adams County Water's customer service line. Because the district distributes water through Denver Water's metered infrastructure, consumption spikes above baseline usage can flag accounts for follow-up. If you believe a violation notice was issued in error — for example, if a neighbor reported runoff that came from a broken pipe rather than deliberate watering — contact South Adams County Water's customer service department promptly to request a review before the warning escalates to a fine.

Other outdoor water rules

Stage 1 restrictions in Commerce City extend beyond lawn irrigation. The following rules apply to other outdoor water uses:

• Vehicle washing: Washing cars, trucks, or RVs at home is permitted only with a shut-off nozzle on the hose. Leaving a hose running unattended while washing a vehicle is prohibited.
• Commercial car washes: Permitted — commercial facilities recycle wash water and are exempt from residential irrigation restrictions.
• Pool filling: Filling new pools or topping off existing pools is allowed but should be done outside the 10am–6pm window where possible. Pools must have a functioning cover to reduce evaporation loss.
• Pressure washing: Hard surface pressure washing (driveways, patios, siding) is discouraged during Stage 1. Using a broom instead of a hose to clean paved surfaces is required where practical.
• Decorative fountains: Recirculating fountains are permitted. Fountains without recirculating pumps that discharge water to a drain or lawn must be shut off.
• Irrigation of non-vegetated surfaces: Watering streets, sidewalks, driveways, or gutters is prohibited at all times — this includes runoff from over-irrigation that crosses onto pavement.
• Construction water: Dust suppression and concrete curing water use at active job sites requires pre-authorization from South Adams County Water under Stage 1.

Water source and infrastructure

Commerce City's water supply runs through South Adams County Water and Sanitation District, which operates as a wholesale distribution customer of Denver Water. That means Commerce City residents are ultimately dependent on the same raw water infrastructure that serves Denver proper.

Denver Water's system draws from two primary watersheds. The South Platte River watershed, on the eastern slope of the Continental Divide, feeds directly into Chatfield Reservoir and Marston Reservoir before treatment. The Blue River watershed on the western slope feeds Dillon Reservoir in Summit County, which delivers water through the Harold D. Roberts Tunnel under the Divide to eastern slope storage. Additional storage comes from Gross Reservoir in Boulder County, which Denver Water is currently expanding under a long-running federal permit.

Treated water for the Commerce City service area passes through Denver Water's Moffat Treatment Plant or Marston Treatment Plant depending on the source blend, then moves through transmission mains into South Adams County Water's local distribution network. South Adams County Water also holds water rights in the South Platte system that provide supplemental supply during high-demand periods.

The current Stage 1 drought declaration reflects reduced inflows into Denver Water's mountain reservoirs driven by below-average precipitation across the South Platte and Blue River drainages in the 2025–2026 water year. Combined storage across Denver Water's reservoir system fell below thresholds that trigger mandatory Stage 1 action, which cascades to all distribution customers including South Adams County Water. Commerce City residents are not drawing from a local aquifer — their supply is directly tied to mountain runoff hundreds of miles to the west.

Brown lawn protections in Colorado

Colorado Revised Statute CRS § 37-60-126 protects Commerce City homeowners from HOA fines and enforcement actions for allowing their lawns to go dormant or brown during periods of mandatory water restrictions. Under this statute, an HOA cannot penalize a property owner for reduced irrigation or lawn browning when a government entity or water provider — in this case, South Adams County Water — has declared mandatory restrictions. The protection applies as long as the homeowner is complying with the active Stage 1 schedule, not simply neglecting their lawn independently of the restrictions.

If your HOA has sent a violation notice or fine related to lawn appearance during the current Stage 1 Mandatory period, you are entitled to contest it under CRS § 37-60-126. Document the dates, keep copies of the notice, and respond in writing referencing the statute and South Adams County Water's active mandatory restriction order.

Use this template response to your HOA:

"This letter is to formally contest the landscaping violation notice dated [date]. Commerce City's water provider, South Adams County Water, has declared Stage 1 Mandatory water restrictions currently in effect, limiting outdoor irrigation to two days per week with a seasonal start date of May 4, 2026. Under Colorado Revised Statute § 37-60-126, a homeowners association may not impose fines or penalties on a property owner for landscape conditions resulting from compliance with mandatory government water restrictions. I am in compliance with South Adams County Water's Stage 1 schedule. Please rescind this notice and confirm in writing that no fine will be assessed."

Lawn care during restrictions

Commerce City sits at approximately 5,100 feet elevation on the Front Range, with a semi-arid climate that supports cool-season grasses as the primary turf choices. Only grasses suited to this climate are relevant here.

Grass Type	Drought Tolerance	Dormancy Behavior	Watering Priority Under Stage 1
Kentucky Bluegrass	Low–Moderate	Goes dormant quickly; recovers with water	Reduce — allow dormancy, do not force green
Tall Fescue	Moderate	Holds color longer than Bluegrass	Medium — deeper roots tolerate gaps better
Buffalograss	High	Native; handles extended dry periods	Low — thrives with minimal supplemental water
Blue Grama	High	Native prairie grass; dormant in heat	Low — drought-adapted, minimal irrigation needed

The most common turf in Commerce City is Kentucky Bluegrass, which is also the least drought-tolerant option. During Stage 1, the practical strategy is to let Bluegrass go dormant rather than fight to keep it green on two watering days. Dormant Bluegrass is not dead Bluegrass — it will recover when restrictions ease and precipitation returns. Raise your mower height to 3 to 3.5 inches, which reduces heat stress and slows moisture loss from the soil surface. Avoid fertilizing cool-season lawns during drought periods, as nitrogen pushes growth that increases water demand.

Homeowners in Commerce City with Buffalograss or Blue Grama lawns are in a significantly better position — both are native to the shortgrass prairie ecosystem that Commerce City sits within, and both can go weeks without irrigation without permanent damage. If you have a mixed lawn or are planning a renovation after restrictions lift, Colorado State University Extension recommends transitioning high-use zones to buffalo or blue grama blends, which typically require 75 percent less water than Kentucky Bluegrass in Front Range conditions. The City of Commerce City and South Adams County Water have historically supported turf conversion rebate programs — contact the district directly to ask about current incentives before the 2026 season gets underway.

Common questions about Commerce City water restrictions

When can I actually start watering outdoors in Commerce City in 2026?

The earliest you may begin outdoor irrigation is May 4, 2026. South Adams County Water approved a delayed start to the outdoor watering season — pushing it back from the original April 13 date — in response to the ongoing Stage 1 drought conditions affecting Denver Water's reservoir system. Running your sprinkler system before May 4 violates the seasonal delay regardless of what days or hours you use.

What days of the week am I allowed to water at my address?

Your two assigned watering days are determined by your property address — typically odd-numbered street addresses water on one pair of days and even-numbered addresses on another. South Adams County Water sets these assignments for its service territory, and the exact day pairs can vary by zone. Call South Adams County Water's customer service line or check your billing statement for your specific assigned days before starting your irrigation system after May 4.

Can I water before 10am or do I have to wait until after 6pm?

You can do either — or both, within the same day. The rule prohibits watering between 10am and 6pm. Watering before 10am is the most efficient window in Commerce City's climate because temperatures are lower, wind is typically calmer, and evaporation losses are minimal. Watering after 6pm is permitted but increases the risk of fungal disease on cool-season grasses if foliage stays wet overnight. Morning watering is the better choice wherever your timer allows it.

Can I wash my car at home during Stage 1 restrictions?

Yes, but only using a hose with a shut-off nozzle attached. Leaving a free-running hose while washing a vehicle is prohibited under Stage 1 rules. If you prefer to avoid the hassle entirely, commercial car washes in Commerce City are permitted to operate normally — they recycle wash water under state environmental permits and are not subject to the residential irrigation restrictions.

Does South Adams County Water use smart meters to catch violations?

South Adams County Water operates advanced metering infrastructure through Denver Water's distribution network. Meter data is read remotely and can flag accounts showing significant consumption spikes during restricted hours or prohibited days. While the district does not publicly detail its full enforcement algorithm, field staff also conduct visual patrols — especially during the 10am–6pm blackout window when sprinkler violations are easiest to observe from the street. Neighbor complaints submitted to South Adams County Water's customer service line are also a primary trigger for enforcement visits.

Are drip irrigation systems really exempt from the two-day limit?

Yes. Drip irrigation — including soaker hoses and low-volume emitters — is exempt from the day-of-week restrictions under South Adams County Water's Stage 1 rules. This makes drip systems the best tool for keeping vegetable gardens, flower beds, and established trees alive without consuming your two permitted spray-irrigation days. If you are currently using overhead sprinklers on garden beds, switching to drip now will give you more flexibility for the rest of the season.

What happens to my lawn if I stop watering entirely — will it survive?

Most established Kentucky Bluegrass lawns in Commerce City will go dormant but not die if irrigation is reduced or stopped during Stage 1. Bluegrass has a root system capable of surviving 4 to 6 weeks of dormancy, after which permanent crown death becomes a risk. Two watering days per week, applied deeply (at least 1 inch per session) during the early morning, is sufficient to maintain dormancy-level survival in most cases without forcing active green growth. Tall Fescue lawns are more resilient and can tolerate the two-day schedule with less risk of permanent damage. Native grasses like Buffalograss need little to no supplemental water to survive a Front Range summer drought.

Does the Stage 1 drought declaration affect my HOA's ability to fine me for a brown lawn?

No — your HOA cannot legally fine you for lawn browning caused by compliance with South Adams County Water's Stage 1 Mandatory restrictions. Colorado Revised Statute § 37-60-126 explicitly prohibits HOAs from penalizing homeowners for landscape conditions that result from mandatory water restrictions imposed by a water provider. Keep a copy of South Adams County Water's current restriction notice and your watering schedule log in case you need to contest any HOA enforcement action in writing.

What days can I water my lawn in Commerce City?

2 assigned days/week (South Adams County Water delayed to May 4) Hand watering with a shut-off nozzle is typically allowed any day during permitted hours.

What time can I water in Commerce City?

Watering is allowed Not 10am-6pm. Watering outside these hours is a violation even on your assigned day.

What are the fines for watering violations in Commerce City?

First offense: Warning first. Repeat violations: Fines. Contact South Adams County Water for the full enforcement schedule.

When will water restrictions end in Commerce City?

Current Stage 1 Mandatory restrictions are in effect through Until conditions improve. Monitor South Adams County Water for the latest status.

Can I hand water during Commerce City water restrictions?

Yes. Hand watering with a hose fitted with a shut-off nozzle is generally allowed on any day during permitted hours. Drip irrigation and soaker hoses are also typically exempt from the day-of-week schedule. Confirm specifics with South Adams County Water.

How do I report a water waste violation in Commerce City?

Contact South Adams County Water. Most utilities accept online reports and respond within 48 hours.