Boulder's Tiered Water Rates and Leak Adjustments: What a Hidden Leak Really Costs

How Boulder's Five-Block Billing System Works

Boulder charges for water in five consumption blocks. Each block applies a different rate to the volume that falls within it. Block 1 is the lowest rate, designed to cover basic indoor needs and reward conservation. Block 5 is the highest rate, intended to make very heavy use expensive. The blocks are not fixed volumes for every customer. Boulder assigns a water budget based on your property's characteristics: lot size, number of plumbing fixtures, and irrigated area.

Usage within your assigned budget falls into the lower blocks. Usage above your budget climbs into the upper blocks. A hidden leak running day and night adds volume that almost always falls in Block 3, 4, or 5. Which block depends on the leak size and how much the household already uses. The upper blocks carry meaningfully higher rates, and a moderate leak can push several thousand extra gallons into them over a billing period.

The practical result is that a hidden leak does not just charge you for the water it wastes. It charges you for that water at a premium rate. A thousand extra gallons in Block 2 is a small add-on. A thousand extra gallons in Block 5 is a larger charge. The same volume of water costs more the higher the tier it falls into.

The Drought Watch Factor in 2026

Boulder declared a Drought Watch in 2026, triggering a voluntary request for customers to limit outdoor watering to twice a week and observe the daytime watering ban between 10 a.m. and 6 p.m. A leak on the always-pressurized irrigation side ignores these requests entirely. It runs around the clock, in direct conflict with the spirit of a drought watch, and accumulates usage at whatever tier the volume reaches. During a drought watch, the city's water budget model puts additional pressure on usage above conservation targets. That means a leak discovered during a drought season may cost more per gallon of waste than the same leak found in a wetter year.

The Leak Adjustment Program

Boulder offers a leak adjustment for customers who discover and repair a hidden leak that produced an abnormally high bill. The program reduces the excess charges on up to two consecutive billing periods per incident. A property can receive up to three adjustments over its history. The adjustment does not return the bill to zero. It applies a reduced rate to the portion of usage above your baseline that is attributable to the leak. You still pay for the water, just at a lower rate on the excess.

To qualify, fix the leak, get a repair invoice or receipt, and submit an adjustment request to the city at UTB@BoulderColorado.gov. The request should identify when the leak was discovered and when it was repaired. The city reviews the usage history to confirm the spike and the return to a lower baseline after the fix.

Speed matters for the adjustment. The clock starts when the bill spikes, not when you notice it. The two-billing-period window means that waiting until a second high bill arrives before investigating and fixing the problem can use up the entire adjustment window before you have taken any action.

Table 1: Boulder Leak Adjustment at a Glance

Factor	How It Works
Billing periods covered	Up to 2 consecutive periods per leak event
Lifetime limit per property	Up to 3 adjustments total
What it adjusts	Overage rate reduced on excess usage; base charge stays
Required documentation	Repair invoice plus adjustment request form
Submission address	UTB@BoulderColorado.gov
Timing requirement	Submit after repair is complete; sooner is better

What the Meter and Your Usage History Tell You

Boulder's smart meters feed into an online portal at BoulderColorado.gov where you can see hourly usage going back 13 months. If you suspect a leak, pull up the overnight chart for the past week. A flat line of usage between midnight and 5 a.m., when nobody in the household is awake, is a strong signal. That flat-line rate, converted to gallons per hour, is roughly what a professional detection crew will confirm when they test your system.

This chart also gives you the earliest possible date for your adjustment claim, because it shows exactly when the elevated usage began. An adjustment request with a date-stamped usage chart is a stronger submission than one without it.

The Number That Changes the Math

The single most valuable thing you can do for your water bill when you suspect a leak is to fix it fast. Every day the leak runs is another day of Block 4 and Block 5 water spending. The detection visit that confirms and locates a leak is often completed in a few hours. The repair, depending on the type, can follow within a day. Every hour between suspicion and repair is more water at the upper-tier rate.

If the meter test shows movement with everything off, that is the moment to call for detection. The bill math rewards speed. Our slab leak and underground line detection services locate the failure before anyone opens a surface, and we start detection the same day in most cases. Call (303) 552-3896 and we can have a crew moving within hours.