Colorado's small community water systems, on the record
The tap water nobody's tracking
Type a Colorado address above and search.
At the edge of an estimated service area
No mapped service area of a small community water system contains this address. If you're in a city or town, you're likely on a municipal utility — TapWaterBook doesn't cover those. If you're rural, you may be on a private well or an unmapped small system.
80 systems have no mapped service area yet and can't be checked this way — see the full map or the systems directory.
Service areas are estimates, not legal boundaries — confirm with the system before relying on this.
- Community water system (estimated position)
- Verified well
135 system positions come from EPA-modeled service areas (estimates); 11 come from service areas on file with EPA (submitted by the system or state, not modeled) — neither is a legal boundary. Verified wells are matched to Colorado DWR well-permit records; plotted locations are approximate — most records place wells by land-survey section, not GPS.
Open the full map — legend detail, unpositioned systems, and methodology
Hundreds of Colorado neighborhoods get their water not from a city, but from a tiny company run by volunteers — a retired neighbor with a binder, a board that meets twice a year. TapWaterBook is the public registry of those systems: 226 of them, serving 29,360 homes, each with its federal record and the corporation behind it, on one page.
Find your water system Explore the statewide map — 146 of 226 systems positioned so far
For the people who run them
If you're the secretary, treasurer, or "the one with the binder" for a small water company or HOA system: records on TapWaterBook are free forever — member roll, billing history, minutes — kept safe for whoever takes over next. 101 of the 226 systems in this registry have health-based violations on their federal record; nearly all of the rest still rack up paperwork violations, because monitoring calendars are unforgiving and volunteers inherit them cold. Good records are the difference. It's the same promise our sibling registry, DitchBook, makes to Colorado's ditch companies: records free, forever, phone-first.
Buying a home on a community system?
The listing says "water: association." That means the tap comes with a membership — assessments, transfer paperwork sometimes, and a volunteer board responsible for federal compliance. Look the system up in the directory before closing: its size, its violation history, and whether the corporation behind it is in good standing.
Ask about any system
Buying, selling, inheriting, or just puzzled by the water company your house belongs to — send the system name and your question.