If you are a homeowner, contractor, or property manager on California's Central Coast or in the Bay Area and you need buried utilities found before you dig, two names may come up. Coastline Utility Services is a Morro Bay-based locating company that serves the Central Coast and the San Francisco Bay Area. AirX Utility Surveyors is a San Marcos-based subsurface utility engineering firm with offices in Sacramento and the Inland Empire.
The core tradeoff is local speed against engineering scale. Coastline Utility Services concentrates on fast, on-site locating, potholing, and pipe inspection for residential and commercial jobs in its region. AirX works statewide on engineering and public-agency projects, with traffic control, permitting, and street repair alongside its locating work.
For homeowners and contractors on the Central Coast or in the Bay Area, we lean toward Coastline Utility Services. The risk is real either way: the Common Ground Alliance's 2024 DIRT Report counted 196,977 damage reports to buried utilities, according to Utility Contractor Magazine.
| Quick Verdict Best for Coastline Utility Services: Central Coast and Bay Area homeowners and contractors who need a private locate, potholing, or a sewer camera inspection scheduled quickly. Best for AirX: Engineering firms and public agencies running large projects that need subsurface utility engineering, traffic control, and permitting from one vendor. Decision rule: If you need a fast locate or pothole for a job on the Central Coast or in the Bay Area, choose Coastline Utility Services. |
| Coastline Utility Services | AirX Utility Surveyors | |
|---|---|---|
| Base | Morro Bay, CA | San Marcos, CA, with Sacramento and Inland Empire offices |
| Years in business | Incorporated in California in December 2010 | Founded in 1999, per its site; BBB lists a 2004 start |
| Service area | Central Coast and 10 Bay Area counties | Statewide California |
| Core services | Utility locating, GPR, potholing, CCTV drain and sewer inspection, leak detection | Locating and mapping, potholing, CCTV with jetting, traffic control, permits, street repair, SUE |
| Customers | Homeowners and commercial contractors | Utility owners, engineering firms, contractors and public agencies |
| Scheduling | Confirmed within 24 hours; scheduled in 1 to 3 business days; emergency slots available | Response within 24 hours, Monday to Friday |
| Certifications | NASSCO-certified pipe inspection capability, per its site | WOSB, WBE and SBE certified; DPI Accredited Participant |
| California license | Not publicly listed as of 2026 | #830790, General Engineering and traffic control, per BuildZoom |
| BBB | No profile found as of 2026 | A+ rating, not accredited |
| Pricing | Not published; quote request | Not published |
Coastline Utility Services is a private underground utility locating company based in Morro Bay, incorporated in California in December 2010. It serves the Central Coast, including San Luis Obispo, Atascadero, Paso Robles, and Santa Maria, and 10 Bay Area counties from Sonoma to Santa Clara. It locates gas, water, electric, communication, sewer, storm, and irrigation lines using electromagnetic locators and ground-penetrating radar, and offers air and hydro potholing, CCTV drain inspection, concrete scanning, and leak detection. It describes itself as a smaller, agile company. Its main differentiator is quick scheduling for residential and commercial jobs, with GPS-mapped locate reports.
AirX Utility Surveyors is a woman-owned subsurface utility engineering firm headquartered in San Marcos, with offices in Sacramento and the Inland Empire. It says it was founded in 1999 and was among the first potholing companies in California. Jenn Harris is president and CEO. Its services include utility locating and mapping, air and hydro potholing, CCTV inspection with jetting, traffic control plans, permit processing, street surface repair, and mark-out removal. Its clients include the City of San Diego, the County of San Diego, and engineering firms such as NV5 and Psomas. Its main differentiator is engineering-grade scale for public and infrastructure work.
Both companies locate utilities, pothole to confirm them, and inspect pipes with cameras. Who they build their service around is where they differ.
Coastline Utility Services works directly for homeowners and contractors. Its site lists residential jobs such as pools, patios, fences, and landscaping, and commercial jobs such as excavation and site development. It says a standard residential locate takes one to three hours, and it also offers leak detection and concrete scanning for post-tension cables.
AirX works mainly for engineers, utility owners, and public agencies. It maps utilities to the four ASCE 38 quality levels used in design, from records research up to potholing. It adds the steps a public-road project needs: traffic control plans and crews, permit processing, street surface repair, and mark-out removal. Its staff includes registered civil engineers, licensed general engineering contractors, and geologists.
Why it matters: a homeowner putting in a pool needs a fast, clear mark-out. A city street project needs mapping tied to design standards, plus traffic control and permits.
If you are a homeowner or contractor on a single site, Coastline Utility Services fits. If you are running an engineered public or infrastructure project, AirX covers more of it.
Coastline Utility Services is based in Morro Bay and serves two regions: the Central Coast, from Paso Robles to Santa Maria and into Santa Barbara County, and the Bay Area, including Alameda, Contra Costa, Marin, Napa, Sacramento, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma counties. It says most requests are confirmed within 24 hours and scheduled within one to three business days, with emergency scheduling available.
AirX is based in San Marcos in north San Diego County and works statewide, with a Sacramento office for Northern California and an Inland Empire office. It says it responds within 24 hours, Monday through Friday.
Why it matters: locating is often the last step before digging starts. A crew that is local to your site can reach you sooner and fit around a tight schedule.
If your site is on the Central Coast, Coastline Utility Services is the local option. If your project is in Southern California or spread across the state, AirX's offices cover more ground.
AirX has the longer and more documented record. It says it was founded in 1999 and has completed more than 10,000 projects. Its California contractor license, #830790, covers general engineering and construction zone traffic control, according to BuildZoom. It holds federal Woman-Owned Small Business certification, state SBE and WBE certifications, and is a Damage Prevention Institute Accredited Participant. Its BBB profile shows an A+ rating.
Coastline Utility Services has been an active California corporation since December 2010. Its site says its locating follows APWA color-code standards and that its potholing produces ASCE 38 Quality Level A documentation with GPS coordinates. It mentions NASSCO-certified pipe inspection capability. It does not publish a contractor license number or a founding story, and we did not find a BBB profile.
Why it matters: on public contracts, certifications and a documented license can decide whether a vendor qualifies at all. For a private job, what matters more is accurate marks and a clear report.
If you need a certified, long-established vendor for public work, AirX fits. If you want a local crew for a private job, ask Coastline Utility Services for its license and insurance details when you book.
Neither company publishes prices. Both quote by project.
Coastline Utility Services takes quote requests through its site and says a typical single pothole takes two to four hours, with full-day work for congested corridors. It includes surface restoration with its potholing.
AirX quotes engineering and construction projects and offers bundled services such as locating, potholing, traffic control, and permits, which can be priced together on larger jobs.
To compare quotes fairly, ask each company which ASCE 38 quality level the work meets, what deliverable you receive (paint marks, a GPS-mapped report, or CAD files), whether surface restoration is included, and how it handles lines it cannot trace.
Coastline Utility Services says on its site that it holds five-star ratings on Google, Top Rated Local, and Facebook. Its Yellow Pages listing shows no reviews. Testimonials on its site praise a locate that found three unmarked lines before digging and a quick turnaround with clear explanations for a homeowner's pool project. We found no public complaints.
AirX has an A+ rating on its BBB profile, with no customer reviews shown. Its site lists public and engineering clients rather than consumer reviews. We found no public complaints.
With no verifiable review scores for either company, ask each for references from projects like yours.
Choose Coastline Utility Services if:
Choose AirX if:
Neither company has readable public reviews that show a pattern of praise or complaints. Coastline Utility Services' site testimonials praise finding unmarked lines and quick, clear service, and we found no public complaints for either company.
Yes. AirX Utility Surveyors is a San Marcos company that says it was founded in 1999. It holds California contractor license #830790 for general engineering and traffic control, per BuildZoom, and has an A+ BBB rating. It also serves public agencies such as the City of San Diego.
Coastline Utility Services is based in Morro Bay and serves the Central Coast, including San Luis Obispo, Atascadero, Paso Robles, Morro Bay, and Santa Maria. It also serves 10 Bay Area counties, from Sonoma and Napa to San Mateo and Santa Clara.
Potholing, also called daylighting, uses air or water with a vacuum to dig a small hole and expose a buried line. It confirms the line's exact position and depth. In the ASCE 38 standard, this exposure is Quality Level A, the highest level of utility data.
California's Dig Safe Board says calling 811 gets your utilities marked within two working days. Those marks cover public utility lines only. Call 811 first, then book a private locator for lines on the property side, such as sprinkler, sewer, and private electric lines.
Yes. Coastline Utility Services offers CCTV drain and sewer inspections using high-resolution cameras, and its site mentions NASSCO-certified pipe inspection capability. It pairs this with locating and potholing, so one visit can find a line and check its condition. Ask for the inspection video with your report.
The California Underground Safe Excavation Board, known as the Dig Safe Board, oversees safe excavation around buried utilities. It sets standards, investigates accidents, and runs education and outreach. It also tells anyone digging to call 811 first and wait for marks before breaking ground.
