This guide is written the way a subsurface utility crew would explain the problem to a project manager who has to sign the contract. It covers the warning signs that surface during vetting, the credentials that carry real weight, what belongs in a fair quote, the questions that produce honest answers fast, and the situations where hiring a utility locating company is not the right move at all. No provider fits every site, and a company that claims otherwise has already told you something useful.
Key Takeaways
- A utility locating company that will not put site boundaries, target utilities, and exclusions in writing is quietly transferring risk to you.
- ASCE 38-22 defines four utility quality levels, QL-D through QL-A, and a credible provider states which level it is delivering.
- Non-metallic pipe, broken tracer wire, and abandoned lines defeat every locating technology, so a 100 percent accuracy guarantee is a red flag, not a feature.
- An FHWA and Purdue University study of 71 highway projects quantified $4.62 in savings for every $1.00 spent on subsurface utility engineering.
- State one-call systems mark operator-owned lines to the meter, leaving private laterals, irrigation, and building feeds unmarked.
What are the biggest red flags to watch for when hiring a utility locating company?
The biggest red flags to watch for when hiring a utility locating company are a quote with no written scope, no mention of ASCE 38-22 quality levels, a guarantee of total accuracy, missing insurance, and depth numbers offered without a stated method or tolerance. Each one moves liability off the provider and onto the person paying the invoice.
Nine warning signs come up repeatedly during vetting. None of them requires technical knowledge to spot. They only require reading the proposal closely and asking one follow-up question.
- No written scope of work. The proposal states a price and a dat,e but never defines the search area, the target utilities, or what happens if the crew finds a line outside the boundary.
- Silence on quality levels. A provider that has never mentioned QL-D, QL-C, QL-B, or QL-A is not working to a recognized standard of care, whatever the marketing copy says.
- A guarantee that everything will be found. Physics does not allow it. Plastic pipe with no tracer wire returns no electromagnetic signal, and no honest locator promises otherwise.
- No certificate of insurance offered up front. General liability alone is not enough for work where a wrong mark causes a strike. Professional liability matters he,re too.
- Depth numbers with no method and no tolerance. The estimated depth from an electromagnetic sweep is an estimate. A locator who hands over a depth without saying how it was derived is inviting a crew to trust a number that was never verified.
- One technology is used everywhere. A company that brings only an electromagnetic locator, with no ground penetrating radar and no acoustic or camera option, will miss whole categories of line.
- Paint on the ground as the only deliverable. Marks fade in days. Without photos, a sketch, or a digital file, nothing survives the first rain or the first grading pass.
- A price quoted before anyone asked about the site. Soil conditions, pavement, congestion, and site history change the effort required. A number given sight unseen is a number that will change later.
- Refusal to say what they cannot find. The strongest signal of competence in this trade is a provider who volunteers limitations before you ask.
Two of these deserve extra weight. The accuracy guarantee and the unqualified depth number are the warning signs that most often precede a dispute, because both create a written expectation that no locating method can support in the field.
Why does hiring the wrong utility locating company cost so much?
Hiring the wrong utility locating company costs money because a bad locate does not fail quietly. It fails at the moment a bucket, auger, or trencher is already in the ground. Damage data from the last several years shows how consistent that failure pattern has become, and how little of it is caused by excavators skipping the rules.
The Common Ground Alliance analyzed 196,977 unique damage reports from 2024 across the United States and Canada. Its CGA Index, which tracks year-over-year damage trends, moved from 94.0 in 2023 to 96.7 in 2024, meaning damages rose rather than fell. The top 10 root causes accounted for 85 percent of all reported damages. CGA President and CEO Sarah K. Magruder Lyle summarized the findings by saying, “Incremental change is not enough.”
Locating practice errors sits near the center of the problem. CGA has attributed locating practices as the root cause behind more than a third of all underground utility damage. In many reported 2024 incidents, excavators had followed their state’s notification process but still could not break ground safely, because the locate request came back with an incomplete response.
Contractors report the same thing. A 2021 Associated General Contractors of America survey of 520 construction firms found that 73 percent reported weaknesses in the 811 process, and 78 percent of those firms named the lack of accurate utility locating by facility owners and operators as the weakest element. A later AGC underground damage prevention survey found that nearly two-thirds of utility line strikes involved lines sitting at least two feet away from where they had been marked, and that 87 percent of respondents waited longer than one business day for locators to arrive.
The upside is equally well documented. A January 2000 FHWA and Purdue University study (Publication FHWA-IF-00-014) reviewed 71 highway projects with a combined construction value above $1 billion and quantified $4.62 in savings for every $1.00 spent on subsurface utility engineering.
What credentials and standards should a utility locating company actually have?
A credible utility locating company works to a published standard, names the quality level it is delivering, carries insurance appropriate to underground risk, and marks to the APWA Uniform Color Code. Anything looser than that is a preference, not a standard of care.
The governing document in the United States is ASCE/UESI/CI 38-22, the Standard Guideline for Investigating and Documenting Existing Utilities, published in 2022.
ASCE 38-22 defines four utility quality levels. The Federal Highway Administration is explicit that subsurface utility engineering is a process, not a technology, which is why the quality level, and not the brand of equipment on the truck, is the thing to ask about.
| Quality level | How the data is obtained | What it means for your dig |
| QL-D | Existing records and oral recollection only | Planning-grade awareness. Do not dig against QL-D data alone. |
| QL-C | QL-D data plus a survey of visible surface features, such as valve boxes and manholes | Better context, still no confirmation of what is actually buried between the features. |
| QL-B | Surface geophysics, typically electromagnetic locating and ground penetrating radar, correlated to the survey | Horizontal position of detected lines. The working baseline for most excavation planning. |
| QL-A | Exposure of the utility, normally by vacuum excavation, is then surveyed | Confirmed horizontal and vertical position at a specific point. The only level that resolves a true conflict. |
Beyond the standard, ask about trade credentials and coverage. Industry bodies including the National Utility Locating Contractors Association (NULCA) publish competency material for locate technicians; ask a provider what training and certifications its technicians hold. On insurance, confirm both general liability and professional liability, and confirm limits appropriate to the project value.
How is a private utility locate different from a free 811 locate?
A free 811 one-call locate notifies member utility operators, who mark the facilities they own and maintain, generally stopping at the meter or the property line. A private utility locate is a paid service that traces owner-owned lines beyond that point. The two are complementary, and one does not substitute for the other.
This distinction is where most buyers get hurt. Blue Stakes of Utah 811 states that operators mark only the facilities they own, which usually means up to the meter, and that lines beyond it, including water and sewer laterals, power to a detached garage, irrigation, and propane lines, may not be marked at all. Colorado 811 says the same and directs property owners to hire a private locating firm before excavating.
| Factor | 811 one-call locate | Private utility locate |
| Who pays | Free to the requester, funded by member utilities | Paid by the property owner or contractor |
| What gets marked | Facilities owned and maintained by member operators | Owner-owned lines are defined in the written scope |
| Where marking stops | Typically at the meter or point of service | Wherever the agreed scope boundary sits |
| Typical deliverable | Paint and flags, plus a ticket status | Marks plus photos, a sketch, and often a CAD or GIS file |
| Non-metallic pipe | Frequently not detectable without a tracer wire | Addressed with GPR, acoustic tools, or a camera and sonde |
| Abandoned lines | Generally out of scope | Can be included if the scope says so |
| Depth information | Rarely provided | Estimated at QL-B, confirmed only at QL-A |
| Legally required | Yes, in every state, before excavation | No, but often required by contract or insurer |
A useful rule from the field: call 811 first, then read what came back. If the ticket is clear but the dig area sits past a meter, past a property line, or anywhere a previous owner installed something, the site still needs a private locate. Providers that specialize in this work, including private utility locating services from Bess Utility Solutions, scope the job around exactly those gaps rather than around what the one-call ticket already covered.
What does a fair utility locating quote look like?
A fair quote from a utility locating company reads like a scope document with a price attached, not a price with a scope implied. It names the boundary, the target utilities, the quality level, the technologies in use, the exclusions, the deliverables, and the basis of the price. If any of those seven are missing, the gap will be resolved later, and not in your favor.
| Quote line item | What a fair quote says | The red flag version |
| Scope boundary | A defined polygon, address, or stationing with square footage | “The job site” |
| Target utilities | Named: electric, gas, water, sewer, telecom, irrigation, unknowns | “All utilities” |
| Quality level | States QL-B, or QL-A, at named test hole locations | No mention of ASCE 38-22 |
| Technologies | EM locating, GPR, and the fallback method for non-metallic pipe | “Industry-standard equipment” |
| Exclusions | Written list of what will not be found and why | Silence |
| Deliverable | Marks, timestamped photos, field sketch, digital file, report | Paint only |
| Depth | Estimated with method and tolerance stated, or confirmed by test hole | A number with no qualifier |
| Price basis | Hourly, half day, or per site, with mobilization stated | A lump sum with no unit rate |
| Typical market range | Stated as hourly, half-day, or per-site with mobilization | A price far below every other bid, with no explanation |
| Re-mark policy | How long marks are warranted, and the cost to refresh them | Not addressed |
The lowest bid is not automatically the wrong one. A low bid paired with a narrow, honest scope can be exactly right for a small job. A low bid paired with a broad promise is the combination that should worry you, because the only way to reconcile the two is to cut effort in the field.
Which questions should you ask before you hire a utility locating company?
Eight questions separate a professional locating provider from a paint contractor. What matters is less the answer than whether the answer is specific, unhesitating, and consistent with the written scope.
- What quality level are you delivering, and where? A good answer names QL-B across the site and QL-A at specific test hole locations, if any.
- What will you not be able to find on this site? A good answer names non-metallic pipe without tracer wire, abandoned lines, and deep or congested runs before being asked twice.
- How do you handle plastic water and sewer lines? A good answer describes GPR, sonde, and camera, or acoustic methods, and explains when each fails.
- Is the depth you provide estimated or verified? A good answer distinguishes an EM depth estimate from a surveyed test hole and states a tolerance.
- What do I receive when you leave? A good answer lists marks, timestamped photos, a field sketch, and a digital file, with a delivery timeline.
- Who is actually on site, and what is their experience? A good answer names the technician’s role and years of locating, not the company’s founding year.
- What are your general liability and professional liability limits? A good answer produces a certificate of insurance without a follow-up email.
- What happens if a line is struck inside your marked area? A good answer describes the investigation process calmly. Evasion here is disqualifying.
Ask the second question first if you only have time for one. A provider that leads with its limitations is nearly always the provider that documents its work well.
How do you compare your options across utility locating companies?
When it makes sense to hire a private locator
Hiring a private locator makes sense whenever excavation crosses a boundary the one-call system does not cover, or whenever the consequence of a strike exceeds the cost of the locate. That includes commercial and campus sites with lines running between buildings, any property with irrigation or site lighting, older parcels with undocumented remodels, and any dig near fiber, high-voltage feeds, or gas. It also makes sense when a contract or an insurer requires documented subsurface due diligence, which is increasingly common on commercial work.
How to compare your options
Compare providers on scope, quality level, deliverables, and honesty about limits. Price is the fourth variable, not the first. The three service tiers below cover most of what buyers encounter.
| Basic locate | Standard private locate | SUE-grade investigation | |
| What you get | EM sweep, paint marks | EM plus GPR, marks, photos, sketch, digital file | Records research, geophysics, vacuum excavation test holes, and surveyed deliverables |
| Quality level | Roughly QL-C to QL-B, often unstated | QL-B | QL-B site-wide with QL-A at test holes |
| Best for | Small residential digs with known, metallic lines | Most commercial excavation, site work, and trenching | Design phase work, utility conflict resolution, high-consequence crossings |
| Outcomes | Reduced but not managed risk | Documented horizontal positions you can plan around | Confirmed three-dimensional positions that resolve conflicts before construction |
Choose a standard private locate if your excavation is shallow to moderate, the site has private lines past the meter, and you need a defensible record of what was found. Choose a SUE-grade investigation when the design depends on the answer, when a strike would stop the project, or when you need vertical position and not just a line on the ground. Choose a basic locate only if the dig is small, the lines are known and metallic, and you accept that plastic pipe and abandoned conduit will not be found.
What results are expected
Expect a clear picture of detectable lines, an explicit statement of what could not be detected, and a record you can hand to your excavation crew and your insurer. Do not expect certainty. Marks indicate a corridor where a utility is believed to exist, not a centerline, and every state’s tolerance zone exists precisely because that corridor has width. The measurable outcome of good locating is fewer surprise stoppages and a documented chain of diligence, which is what the FHWA and Purdue return-on-investment figure of $4.62 per $1.00 was ultimately measuring.
What do experienced locators see go wrong on real sites?
What crews report in practice is that failures cluster around a small number of physical realities, not around carelessness. Understanding the five below tells a buyer more about provider quality than any capability sheet.
Plastic pipe is the most common one. PVC and HDPE water and sewer lines carry no signal. If the original installer laid tracer wire, it can be energized and traced. If the wire was never installed, was cut during a later repair, or corroded at a splice, the line is invisible to electromagnetic locating. A capable provider responds by reaching for ground penetrating radar, a sonde pushed through the line, or acoustic detection, and by telling you up front that soil conditions determine whether any of the three will work.
Ground-penetrating radar is not a universal answer either. GPR performance drops sharply in wet clay and in heavily reinforced concrete, because both attenuate or scatter the signal. Buyers are sometimes told GPR will see everything on a site where the soil makes that impossible. A provider that walks the site, checks the soil, and revises the method before quoting is demonstrating the judgment ASCE 38-22 describes as professional judgment.
Three others recur. Duct banks and congested corridors mask secondary lines behind the strongest signal, so a single mark can hide two or three conduits. Abandoned lines look identical to live lines from the surface and are frequently outside the standard scope. And marks themselves are perishable, fading within days under traffic, rain, or grading, which is why a deliverable that exists only as paint is a deliverable that expires before the excavator arrives.
The pattern buyers describe after a strike is remarkably consistent: the ticket came back clear, the site was on private property past the meter, and nobody had asked what the clear status actually covered. A clear response means no public lines were found in the notified area. It has never meant the ground is empty.
When is hiring a utility locating company not the right move?
A private utility locate is not always the correct purchase, and saying so is part of an honest evaluation. Three situations come up often.
- The dig is entirely in the public right-of-way. If excavation stays in the street or the utility easement and never crosses onto private lines, the free 811 ticket covers the facilities that exist there. Paying for a private locate adds documentation, not detection.
- You actually need a test hole, not a locate. If a design decision depends on the exact depth of a specific line, geophysics alone will not settle it. That work is vacuum excavation to QL-A, and a locating vendor without excavation capability should tell you so and refer it out.
- You need a survey or a sealed drawing. Depicting utilities on a plan set for design usually requires a licensed professional and a deliverable prepared under ASCE 38-22, sometimes coordinated with a licensed land surveyor. A marking crew alone does not satisfy that requirement.
A provider that recognizes these boundaries and turns work away is showing you the exact judgment you are paying for on the jobs it does accept.
Frequently Asked Questions
How much does private utility locating cost?
Private utility locating is usually priced hourly, by the half day, or per site, with mobilization stated separately. Cost scales with site size, pavement, congestion, and whether test holes are required. Current U.S. ranges vary by market and provider. Treat any bid far below the rest of the field as a scope question, not a savings.
Can a utility locating company guarantee it will find every line?
No. Non-metallic pipe without tracer wire, abandoned conduit, deep runs, and lines inside congested duct banks defeat locating technology under normal conditions. A guarantee of 100 percent detection is one of the clearest red flags to watch for when hiring a utility locating company, because it commits the provider to something the physics of the work does not support.
Does calling 811 mean I do not need a private locator?
No. State one-call systems notify member utility operators, who mark only the facilities they own and maintain, generally stopping at the meter or the property line. Blue Stakes of Utah 811 and Colorado 811 both advise property owners to hire a private locating firm for lines beyond that point, including irrigation, sewer laterals, and power to detached structures.
What is ASCE 38-22, and why should a buyer care?
ASCE 38-22 is the American Society of Civil Engineers standard guideline for investigating and documenting existing utilities.. It defines four utility quality levels, QL-D through QL-A, that describe how utility data was obtained and how much confidence it deserves. Buyers should care because the quality level, stated in writing, is the only objective measure of what a locate is worth.
What insurance should a utility locating company carry?
At a minimum, general liability and professional liability, since a locating error is a professional error that produces physical damage. Ask for a certificate of insurance before signing, not after a strike. Appropriate limits depend on project value and the utilities present.
How long does a private utility locate take to schedule and complete?
Scheduling depends on regional demand, and field time depends on site size, surface conditions, and how many utility types are in scope. For context, AGC survey respondents reported that 87 percent waited longer than one business day for public locators to arrive. Private scheduling norms differ.
How should you make the final call?
The red flags to watch for when hiring a utility locating company all point at the same underlying question: Is this provider willing to be specific in writing about what it will do, what it will find, and what it cannot find?
The buyers who avoid the problem do something unglamorous. They read the scope, ask what the crew will miss, insist on a quality level, and keep the deliverable. That is the whole method, and it costs one careful conversation before the contract is signed.
Read more articles like this one to sharpen how you evaluate subsurface contractors, standards, and quotes before you break ground.