How Boulder Handles Water Use Rules: A Practical Guide

Boulder maintains 143 local ordinances across all categories, and 2 of those deal specifically with water use rules. Here is a breakdown of what the city actually requires, what is prohibited, and where Boulder falls on the strict-to-permissive spectrum compared to other cities.

Turf Replacement Rebates

Boulder removes a permitting hurdle for water-conscious landscaping: under Section 9-9-12(d), B.R.C. 1981, a property with a prior site review or form-based code approval can convert or replace its turf without a modification or amendment to that approval, as long as landscaped area, tree cover, and plant standards are maintained.

Key details: Prior-approval exemption: No modification needed for turf conversion. Condition 1: Landscaped area and quantities maintained. Condition 2: Existing trees preserved except junipers. Condition 3: Must follow Approved Tree and Plant List. Purpose tie-in: Water conservation, Sec. 9-9-12(a)(3).

Failing to maintain the required landscaped area, removing preserved trees outside the juniper exception, or installing plant material inconsistent with the Boulder Approved Tree and Plant List during a turf conversion is a violation of Section 9-9-12(f)'s compliance mandate, enforced under the general penalty in Section 5-2-4, B.R.C. 1981: a fine of up to $2,650 per violation, up to ninety days in jail, or both.

If you are coming from a city with tighter rules, you will find Boulder gives residents more flexibility on turf replacement rebates.

Recycled Water Rules

Boulder prohibits any water utility customer from installing graywater treatment works or using graywater on their property under City Code Section 10-10-3. The ban, added by Ordinance No. 8720 in 2026, sunsets on December 31, 2027 unless the city council extends it, and violators face prosecution under the general penalties chapter.

Key details: Governing section: City Code § 10-10-3. Rule: Graywater treatment works and use prohibited. Enacted by: Ordinance No. 8720 (2026). Sunset date: December 31, 2027, unless extended. Penalty: Prosecution under general penalties, Section 5-2-4.

Violating the graywater ban can be prosecuted under Section 5-2-4, "General Penalties," B.R.C. 1981, and Section 10-10-3(d) makes clear that the city is not required to pursue an administrative hearing before bringing that criminal action. There is no separate civil fine schedule written into this section, so enforcement runs directly through municipal court.

This is not one of those rules that cities tend to ignore. Boulder actively enforces its recycled water rules requirements.

The Bottom Line

Boulder's water use rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Boulder is broadly strict or permissive.

These rules come from Boulder's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.