What DPR's Written Guidance Means for Ground Squirrel Work in California

In 2026, a coalition of California pest control companies asked the Department of Pesticide Regulation a question that had been unresolved for years: what licenses does mechanical kill-trapping for hire actually require? DPR's Licensing and Certification Unit answered in writing.

The answer is straightforward. If you run a licensed pest control business in California, you already hold what you need.

Why the question came up

The chemical side of ground squirrel control has narrowed steadily. AB 1788 (2020) established a statewide moratorium on most second-generation anticoagulants. AB 1322 (2023) extended it to diphacinone — the first-generation bait most operators relied on for ground squirrel work — and designated it a restricted material. AB 2552 (2024) added chlorophacinone and warfarin. For the residential, commercial, and wildlife-adjacent properties where ground squirrel damage is worst, the products that used to carry this work are largely gone.

Mechanical control moved into the gap. But the licensing framework hadn't caught up. Live trapping had a known exemption. Baiting was covered by a QAL. Kill-trapping for hire had no written guidance at all, and operators were left interpreting it themselves.

The inquiry

A coalition of companies specializing in burrowing rodent management raised the question with DPR:

• Lenz Pest Control — Santa Barbara

• Smith's Pest Management — San Jose

• Clark Pest Control — Lodi

• Go-Pher The Kill — Riverside

• Cragoe Pest Services — Moorpark

• MRS Environmental — Santa Barbara

Dale Shreve, General Manager at Lenz Pest Control, coordinated the inquiry.

What DPR said

The key move in DPR's response is how California defines the work itself. Under Food and Agricultural Code section 11403, pest control means the use of any substance, method, or device to control a pest — not only the use of pesticides. A mechanical kill trap is a device used to control a pest. So it counts as pest control, and it falls under DPR's authority.

From there the licensing follows directly. When a business is hired to control ground squirrels with mechanical kill traps, it is performing pest control for hire, which requires a licensed Pest Control Business and a Qualified Applicator License supervising operations. One detail worth noting for how you staff it: the QAL's category has to match the setting where the work is performed — DPR was specific that categories are setting-based.

The live-trapping exemption is the other half of the picture. Under FAC 11531(e), live capture and removal of vertebrate pests without pesticides is exempt from DPR licensing. But that exemption is narrow in two ways that matter. It doesn't extend to mechanical kill devices — kill-trapping stays with DPR. And it doesn't exempt anyone from the California Fish and Game Code; live-capture work remains subject to whatever Fish and Game rules apply.

For an operator, the practical result is clean: mechanical ground squirrel control for hire sits inside the credentials a licensed pest control business already holds. No new license, no second agency to register with.

What the work looks like on the books

A recent two-month project on a residential property in the mountains above Santa Barbara gives a clear picture of the operational shape. Ground squirrels were digging beneath the main house and a back structure and living in the sub-area underneath. Two TerraTrap GS units were installed.

Time on site. Installation ran about 40 minutes. Follow-up visits averaged 20 minutes. The full two-month project took five to six service trips.

Results. 34 confirmed kills. Camera monitoring showed activity dropping off sharply by week seven, and by the final week there was none observed around the structures.

That split matters. The trap servicing is the recurring line, but the exclusion work is the larger single item, and it only becomes sellable because the trapping brought activity down far enough to make sealing worth doing. The sealed entry points were inspected every two weeks and none were reopened.

What the system does

The TerraTrap kills ground squirrels mechanically and humanely, using the CO2-powered Goodnature A18 strike mechanism housed in a camouflaged enclosure that resets itself after each activation.. No bait stations to log, no rodenticide use reporting.

It requires an establishment period. The first one to two weeks mean active pre-feeding and regular checks while the squirrels accept the housing. Once established, it works between visits rather than requiring a technician on site for each capture — which is what makes a 20-minute follow-up cadence possible in the first place.

It also won't clear a mountain. On the Santa Barbara property the goal was never eliminating squirrels from the surrounding environment; it was stopping the damage under the structures. For most jobs, that's the right frame to set with the customer.

Adding ground squirrel service

The licensing question is answered, the rodenticide door is closing, and property owners in agricultural and estate markets are increasingly asking for poison-free programs.

For volume or program pricing, or to talk through what a ground squirrel route looks like operationally:

Linda Rithvixay — 877-992-8868 ext. 711 — linda.rithvixay@automatictrap.com

This article is general information, not legal advice. Operators should confirm licensing requirements for their specific services with DPR and any other applicable agencies.