The math is not close. The Common Ground Alliance puts the cost of damage to buried utilities at more than $30 billion a year in the United States. One strike on a fiber trunk, a gas service, or a fire main can erase the savings from a hundred discount locates.
Key takeaways
- A locate that never names a quality level under ASCE 38-22 hands you paint marks with no defined accuracy behind them.
- Ask whether technicians are trained to the Nulca Competency Standard before you ask which brand of locator they carry.
- Electromagnetic and radar readings estimate depth. Only exposing the line confirms it, which is Quality Level A work.
- An FHWA study by Purdue University measured $4.62 in savings for every $1.00 spent on subsurface utility engineering.
- One-call members mark only the lines they own, so anything past the meter needs a separate private utility locating scope.
What are the biggest red flags to watch for when hiring a utility locating company?
The most reliable red flags to watch for when hiring a utility locating company are procedural, not technical. A firm that will not put a quality level, a search area, and a deliverable in writing is telling you it does not intend to be measured. A firm that promises depth from the surface is telling you it either does not understand its instruments or expects you not to. And a firm that quotes a job without asking what you are digging, how deep, and where, has not priced your project. It has priced a generic afternoon.
In practice, the bids that cause trouble later are the ones that look simplest up front. They arrive fast, they contain a single number, and they leave every assumption unstated. The table below pairs the eight warning signs buyers report most often with what each one usually signals and the question that flushes it out.
| Red flag | What it usually signals | What to ask instead |
| No written scope or quality level | The provider has not committed to any accuracy standard | “Which ASCE 38-22 quality level are you delivering, and on which lines?” |
| Depth guaranteed from the surface | An estimate is being sold to you as a verified measurement | “Will you pothole to confirm depth, and is that in this price?” |
| “Our radar finds everything” | Soil, moisture, and depth limits are being left out of the conversation | “What site conditions defeat your equipment, and how will you report what you could not confirm?” |
| No proof of technician training | Training is informal, or it happened once, years ago | “Are your locators trained to the Nulca Competency Standard, and can I see the records?” |
| Insurance certificate not offered up front | Coverage may be thin, expired, or missing professional liability | “Can you send a current certificate of insurance with general and professional liability limits?” |
| Paint is the only deliverable | Nothing survives the next rain, and nothing is auditable later | “What do I receive: marked ground, field sketch, CAD or GIS file, photos, and a report of unlocatable lines?” |
| Price far below every other bid | Sweep time, coverage area, or return trips have been cut | “How many field hours are budgeted, and what happens if the sweep takes longer?” |
| No questions about your dig plan | The location has not been matched to the actual work | “What do you need from me to define the search area and the excavation footprint?” |
Why does hiring the wrong utility locator cost more than the locate ever will?
A locate is a small line item sitting in front of a large one. The Common Ground Alliance reports that damages to buried utilities cost the United States more than $30 billion each year, and its 2024 DIRT Report found that the top ten root causes accounted for 85 percent of all reported damages, with the same patterns repeating year after year. Failure to notify 811, failure to pothole, and inaccurate or missing marks sit near the top of that list every cycle. None of those are exotic failures. They are the predictable result of rushing the step that costs the least.
The return on doing it properly has been measured. The Federal Highway Administration commissioned Purdue University to study 71 highway projects with a combined construction value of above $1 billion, and the resulting study quantified $4.62 in savings for every $1.00 spent on subsurface utility engineering. Obtaining higher quality level data on those projects cost less than 0.5 percent of the total construction cost and produced roughly 1.9 percent in construction savings. Direct repair and downtime costs for a single strike vary widely by facility type and location, so treat any dollar figure a vendor quotes you as unverified until they show you their claims history.
Schedule risk is the quieter cost. CGA analyzed data from eight 811 centers and found that excavators faced an average 38 percent chance of being unable to start work on time because locate responses were incomplete. A utility locating company that misses its window does not just delay your dig. It pushes crews, equipment, and subcontractors into a week they were never scheduled for.
What credentials and training should a utility locating company actually have?
Start with training, because the instrument in a technician’s hand does not interpret its own signal. Nulca, formed in 1994 and known before that as the National Utility Locating Contractors Association, published its first Competency Standard for locating technicians in 1996 and is now on its fifth revision. The standard has been recognized by CGA Best Practices, and Nulca runs an accreditation program launched in March 2016 in partnership with NSF-ISR, which independently audits a company’s training materials and delivery against the ten components of the standard. Asking a utility locator whether their program is accredited to that standard is a fair, answerable question. A firm that trains properly will produce the paperwork without hesitation.
Regulation is uneven, and that is exactly why credentials matter here. Private locating is not licensed the way electrical or plumbing work is in most states, though some jurisdictions define a qualified person for subsurface locating in statute. Where no license exists, the burden of vetting falls entirely on you.
Before you sign, work through this list with the provider:
- Written proof of Nulca-standard training or accreditation for the technicians who will be on your site, not just the company owner.
- Operator qualification records if the work involves natural gas or hazardous liquid pipeline facilities.
- A current certificate of insurance showing general liability, professional liability or errors and omissions, workers’ compensation, and auto coverage.
- Two or three references from projects of similar size, congestion, and soil type, with permission to call them.
- Whether the firm submits damage and near-miss data to CGA’s DIRT program, which signals a company that measures its own misses.
What does a legitimate utility locating scope of work include?
A defensible scope names the standard. ASCE 38-22, the Standard Guideline for Investigating and Documenting Existing Utilities, was published in 2022 and replaced ASCE 38-02. It defines four utility quality levels, QL-D through QL-A, that tell you exactly how the data in front of you was produced. The Federal Highway Administration is blunt about the point of it: subsurface utility engineering is a process, not a technology. Any provider who talks only about equipment and never about quality levels is describing a tool, not a deliverable.
| Quality level | What the provider actually does | What you can rely on | Typical use |
| QL-D | Reviews existing records, as-builts, and recollections | That a utility probably exists somewhere in the corridor | Route selection, early planning |
| QL-C | Surveys visible surface features and correlates them with records | Approximate alignment between visible structures | Preliminary design, budgeting |
| QL-B | Designates lines with electromagnetic and radar geophysics | Horizontal position of detectable lines within the marked corridor | Design, conflict screening, and most private locates |
| QL-A | Exposes the line by test hole, usually vacuum excavation | Verified position, depth, size, material, and condition at that point | Crossings, tight tie-ins, anywhere a strike is unacceptable |
The scope should also state the search area in feet, the facility types included and excluded, the marking method, ticket references, and the deliverable format. If depth is required anywhere, the scope must say which points will be potholed. A scope that says “locate utilities on site” is not a scope. It is a hope, and it will be read very differently by you and by the provider on the day something goes wrong.
Which promises should make you walk away from a utility locating company?
Some claims are not aggressive marketing. They are physically impossible, and a provider making them is either untrained or counting on you not knowing the difference. Non-conductive pipe with no tracer wire, deeply buried lines in wet clay, abandoned services with no signal, and congested corridors where signals bleed between lines all defeat detection under real conditions. The honest answer to “Can you find everything?” is no, followed by a description of what will be done about the gap.
- “We locate 100 percent of the lines on site.” No geophysical method detects every buried facility. The correct promise is a documented list of what was found, what was not, and where confidence is low.
- “Depth is guaranteed.” Electromagnetic depth is calculated from the signal, and radar depth depends on an assumed soil velocity. Verified depth requires exposure.
- “You will not need to pothole.” Failure to pothole and maintain clearance is a recurring root cause in CGA damage data. A provider who discourages test holes near a critical crossing is managing their cost, not your risk.
- “You do not need to call 811 if you hire us.” Contacting the one-call center is required by law in every state. Private locating supplements the public locate. It never replaces it.
- “Our accuracy rate is 99 percent.” Ask how accuracy is defined, who audits it, and across how many tickets. Without a method, the number is decoration.
One more, quieter than the rest: a provider who never mentions that marks expire. Ticket life and re-mark obligations are set by state law and vary, so a locate performed in April is not evidence of anything in July.
How can you tell if a utility locating quote is fair or too good to be true?
Fair quotes are legible. They separate field time from mobilization, they say what a return trip costs, and they price test holes individually because vacuum excavation is a different operation with different equipment. Suspiciously low bids usually achieve their number by shrinking the one variable nobody sees on paper, which is time on site. A congested commercial lot swept in ninety minutes was not swept. It was visited.
Private locating pricing is set by the market rather than by a schedule, and it moves with region, congestion, soil, and access. Do not accept a number from a blog, including this one. Get two or three written bids on an identical scope and compare the structure, not just the total.
| Line item | How it should be priced |
| Geophysical sweep (EM and GPR) | Hourly, half-day, or by a defined search area, with the hours stated |
| Mobilization and travel | Flat, disclosed before the visit |
| Test hole/vacuum excavation | Per hole, quoted separately from the sweep |
| Deliverable upgrade to CAD or GIS | Flat fee above the field sketch |
| Return trip or re-mark | Stated in the contract before you need it |
| Standby, night, or weekend work | Premium rate, disclosed up front |
What should you ask about insurance and liability before you hire a utility locator?
General liability covers property damage that the provider causes. It does not reliably cover a line they failed to mark, because that is a professional service failure, which is what professional liability or errors and omissions coverage exists for. Many small locating firms carry the first and not the second. Ask for the certificate of insurance, read the limits, and confirm the policy is current on the date of your dig rather than the date of the bid.
Then read the contract. Most locating agreements state that markings are approximate and cap liability at the value of the fee. That language is standard and not by itself a red flag, but it does tell you where the risk actually sits, which is with you. What separates a serious provider is what they add next: a documented process for reporting unlocatable lines, a written record of what was swept, photographs of the marks, and a willingness to discuss their damage history rather than change the subject.
Liability for private lines is murkier than most buyers expect. State one-call statutes generally govern public facility notification. Private lines beyond the meter usually fall to the property owner, and responsibility between owner and contractor is settled by the contract you signed, not by the statute. Establish in writing who orders the public locate, who orders the private locate, and what the price assumes.
How do you compare utility locating companies side by side?
When it makes sense to buy more than a basic location
Buy more when the consequence of a strike is larger than the cost of certainty. That means occupied buildings, live fiber, gas services, fire mains, hospital and campus sites, anything near a school, and any excavation crossing an unknown alignment at depth. Buy less when you are trenching a shallow irrigation line across open ground you have dug before, with records that match what is visible on the surface. The decision is about consequence, not about the size of the contract.
How to compare your options
Compare on four axes and hold every bidder to the same scope: the quality level being delivered, the field hours budgeted, the deliverables you keep afterward, and the insurance behind the work. Price is the fifth axis, and it means nothing until the first four match. A private utility locating bid at QL-B with a CAD deliverable and a QL-B bid with a paint-only deliverable are not the same product, and the cheaper one is often the more expensive one.
| If you are | Buy this | Because |
| A homeowner planting a tree or setting a post | 811 ticket, then a private locate if the yard has irrigation, pool lines, or a detached structure | One-call members mark only the lines they own, up to the meter |
| A contractor on an occupied commercial site | QL-B private locate across the full work area, plus test holes at crossings | Congestion and unrecorded lines make records unreliable |
| A designer or engineer before construction | QL-B designation, escalating to QL-A at conflict points | ASCE 38-22 data quality is what design decisions can defend |
| An owner with a long-term site | Locate plus a CAD or GIS deliverable retained as a record | The map keeps paying you back on every future dig |
What results are expected
Expect marks placed per the APWA Uniform Color Code, a walkthrough at the end of the visit, a written list of what could not be located, and a deliverable you still have in six months. Choose a QL-B private locate if your risk is unknown alignments across a defined work area. Choose QL-A test holes when the design or the excavation depends on a specific depth. Choose the cheapest bid only when the scopes are genuinely identical, which, in practice, they rarely are.
What red flags show up on the jobsite after you have hired a locator?
The interview continues after the truck arrives. A competent technician asks for as-builts and site history before switching anything on, walks the perimeter, and sweeps well beyond the marked dig area because lines do not obey property lines. A technician who steps out, paints in fifteen minutes, and drives off has performed a ritual, not a locate.
- The crew never asks for records, as-builts, or your excavation footprint.
- Only one method is used. Electromagnetic locating and ground penetrating radar find different things, and skipping one leaves a category of line undetected.
- Marks do not follow the APWA Uniform Color Code, or the color used does not match the facility marked.
- The sweep stops at the string line rather than extending past it.
- No photographs, no sketch, no ticket reference, and no written note of anything unlocatable.
- No closing walkthrough, and no explanation of which marks are confident and which are inferred.
Documentation is the single most useful thing a utility locating company leaves behind, and it is the first thing a weak provider drops. Paint disappears in a week. A dated sketch, a photo set, and a list of what could not be confirmed protect you a year later when someone asks what was known before the shovel went in.
Where does 811 end, and a private utility locating company begin?
The one-call system is a notification service, not a subsurface mapping service. When you file a ticket, member utilities mark the facilities they own, and their responsibility generally ends at the meter or property line. Ohio 811 states plainly that service lines and private lines may not be located without contacting a private locating company, and Kentucky 811 uses the same rule of thumb: street to meter is theirs, past the meter is yours. Marks are also a corridor, not a centerline. North Carolina 811, for example, defines the tolerance zone as 24 inches on each side of the mark plus the width of the facility, and inside that zone, you dig by hand or by vacuum.
Everything the ticket does not cover is where private utility locating lives: irrigation, site lighting, secondary electric feeds to shops and pumps, private gas laterals, septic components, and owner-installed fiber. That is a large share of what is actually buried under a developed site. Firms specializing in this work, such as Coastline Utility Services, are hired directly by the owner or the contractor rather than by the utility, which is also why their scope, standard, and insurance are yours to define rather than something you inherit.
File the 811 ticket first. Check positive response before you dig, because a ticket without responses from every notified member is not a completed locate. Then decide, based on what the marks did and did not cover, whether the site needs a private locate on top of it. That sequence is what buyers who have been through a strike do without being asked.
Frequently asked questions
What is the difference between 811 and a private utility locating company?
811 notifies member utilities so they can mark the lines they own, usually up to the meter or property line, at no cost to you. A private utility locating company is hired by the property owner or contractor to find everything past that boundary. The two are complementary, and calling 811 is required by law in every state.
Should a utility locating company guarantee depth?
No. Depth read from an electromagnetic locator is calculated from the signal, and the radar depth depends on the assumed soil conditions. Verified depth requires physically exposing the line, which is Quality Level A work under ASCE 38-22, normally done with vacuum excavation. Treat a surface depth guarantee as a red flag.
How much does private utility locating cost?
Pricing is set by the market rather than a published schedule, and it varies with region, site congestion, soil, and access. Get two or three written bids against an identical scope, and compare field hours, quality level, deliverables, and insurance before you compare totals.
What certification should a utility locator have?
Ask whether technicians are trained to the Nulca Competency Standard, first published in 1996 and recognized by CGA Best Practices, and whether the company holds Nulca accreditation audited by NSF-ISR. Also, ask for operator qualification records if pipeline facilities are involved, and for a current certificate of insurance.
Who is liable if a marked line gets hit?
It depends on whether the line was public or private, whether the marks were accurate, whether the excavator respected the tolerance zone, and what your contract says. Most locating agreements describe marks as approximate and cap liability at the fee. Settle responsibility for public locates, private locates, and potholing in writing before work starts.
How long are utility markings valid?
Ticket life and re-mark obligations are set by state law and differ across states. Marks fade, get graded over, and lose meaning as site conditions change, so a locate performed months earlier should be refreshed rather than trusted.
Keep learning before you sign
Hiring well underground is mostly a matter of asking specific questions in a specific order: what standard, what scope, what deliverable, what insurance, and what happens when something is missed. Take the questions in this guide to your next three bids and see which providers welcome them.
Read more guides like this one on damage prevention, subsurface utility engineering, and safe excavation planning.
