Larkspur runs a small town water system from Denver Basin wells, and our research didn't find a published backflow testing program, so ask Town Hall what applies. If a device leaks, failed or needs installing, call the number on this page to be connected with a local plumber in Larkspur.

What happens when you call
An independent plumber who works in Larkspur will ask what the device protects, where it sits and whether the Town has asked for anything. Because no testing program was confirmed, most calls are about repairing a leaking sprinkler device, replacing a frozen one or adding protection to a new connection. If you're outside town limits, mention it; your water arrangement and rules may differ.
Cost factors
- Repair versus install. Adding a device where none exists involves more fitting work.
- Device type. Vacuum breakers, double checks and reduced pressure assemblies all differ in cost.
- Freeze damage. Split bodies need replacing.
- Travel and access. Rural lots and long runs can add time.
- Permits. Inside town limits, the Town Building Department handles permits, with SAFEbuilt inspections.
What we know about Larkspur
Larkspur is a small town in the East Plum Creek valley along I-25, about 11 miles south of Castle Rock and best known for the summer Colorado Renaissance Festival. The Town's Public Works Department runs the water and wastewater systems inside town limits, overseen by a Water and Sewer Board, with the water system operated under contract by Semocor, Inc. The supply comes from Denver Basin aquifer wells, not surface water.
Our fact sheet doesn't include a backflow program, so we can't give a test schedule. Call Town Hall at 303-681-2324 during business hours to ask; after hours, water emergencies go to Semocor at 303-681-2253. Areas of ZIP 80118 outside town limits aren't covered by the Town's pages. Larkspur's valley gets cold nights through much of the year, and devices on irrigation or campground and festival-area connections face real freeze risk.
Larkspur's permit rules are worth knowing before any work. Inside town limits, the Town itself, not Douglas County, handles building permits, with SAFEbuilt scheduling inspections at 720-641-1956. Outside town, Douglas County takes over. If you're adding a new irrigation system, ask whether the Town wants a specific type of device on it and whether it should be tested once installed.
Before the plumber arrives
- Confirm whether you're inside town limits
- Find the device and clear access
- Know where the main shutoff is
- Ask Town Hall whether a test or permit is needed
Backflow Testing questions in Larkspur
How often does a backflow assembly need to be tested here?
Is a permit needed to add or replace a backflow preventer?
How can I tell which water provider serves my address?
What happens after an assembly fails its test?
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