California Earthwork and Underground Class Codes 6218, 6307, 6315 — All Three Move to $45
Updated: Sep 7
Quick answer
All three California earthwork and underground dual-wage families move from a $40.00 to a $45.00 hourly threshold for policies incepting on or after September 1, 2026 — excavation and its sub-classes (6218/6220), sewer construction (6307/6308), and water or gas mains (6315/6316). That $5.00 move is the largest in the table, tied with carpentry and steel framing.
Source: WCIRB September 1, 2026 Regulatory Filing Quick Reference Guide, approved by the Insurance Commissioner. Verified against the filing, not secondary summaries.
Will we write it? Tell us the operation, the state, and roughly where the mod sits — we'll come back within one business day with a straight answer: yes, no, or what we'd need to see. No ACORD, no loss runs, no obligation. Agents and business owners both welcome. Run it past us here.
First, the stale-table problem
This is the one place in the 2026 dual-wage table where the secondary sources are actively wrong. Several widely-circulated broker summaries still show excavation, sewer, and water or gas mains as "TBD" or "under review" with no approved figure. Those tables were published while the filing was pending and were never updated after approval. The WCIRB's own Quick Reference Guide lists all three at $45.00, effective September 1, 2026.
If you are quoting a 6218, 6307, or 6315 account off a table that says TBD, you are quoting off stale data — and the gap is not small. An account priced against a $40.00 threshold and audited against a $45.00 one hands back every operator earning between those figures to the expensive code.
The classifications, and which code is which
In WCIRB pair notation the first code listed is the low-wage code and the second is the high-wage — and cheaper — code. Format below is trade, low/high code, threshold from September 1, 2026.
Excavation — 6218(1) / 6220(1) — $45.00
Grading land — 6218(2) / 6220(2) — $45.00
Land leveling — 6218(3) / 6220(3) — $45.00
Sewer construction — 6307 / 6308 — $45.00
Water mains or connections construction — 6315(1) / 6316(1) — $45.00
Gas mains or connections construction — 6315(2) / 6316(2) — $45.00
The sub-classification matters even where the threshold is identical, because the sub-class is what appears on the policy and what the auditor tests the work against. A site contractor that digs the pad, grades it, and then lays the sewer lateral is operating in at least two of these, not one.
Why a $5.00 move hits earthwork harder than most trades
Two reasons. First, it is the largest increase in the table — the band of employees who move from the cheap code to the expensive one is five dollars wide rather than two or three, so a larger share of any crew is affected.
Second, earthwork payroll clusters. A pipeline or grading crew is typically a small number of operators, a foreman, and laborers, and the operators tend to sit within a few dollars of each other. When the threshold jumps five dollars, it often does not move one employee out of the high-wage code — it moves most of the skilled crew at once. Contractors who assumed "our operators are well above the threshold" under a $40.00 test frequently discover they are marginal under a $45.00 one.
Three mechanics that decide the outcome
It is a cliff, not a slope. An operator at $44.99 is entirely low-wage payroll; at $45.00, entirely high-wage. No blending, no proration.
It applies employee by employee. Not to the crew and not to a prevailing wage determination on public work, which is a frequent point of confusion in underground utility contracting.
"Regular hourly wage" is a defined term. Overtime premium, bonuses, and per diem generally do not count toward it — which bites hardest in earthwork, where long days and travel pay are routine and owners fold both into their mental hourly figure.
Raise or reclassify? Run it per employee
List every employee earning between $40.00 and $44.99. In earthwork that list is usually longer than the owner expects.
Cost of the raise = ($45.00 − current wage) × annual hours, plus payroll tax and benefit load.
Cost of reclassification = annual payroll ÷ 100 × the rate difference between the two codes × the experience mod.
Compare. The mod multiplies the reclassification cost but not the wage cost, so the worse the mod, the more often the raise wins.
Worked across ten trades side by side in our break-even-by-trade guide; every current threshold lives in the dual-wage tracker.
What else lands on the same renewal
September 1, 2026 also brings a 10.4% advisory pure premium increase and Experience Rating Plan amendments, on top of California's DIR assessments. For an earthwork contractor with crews crossing a five-dollar threshold move, the three compound.
The burden of proof sits with the employer
Assignment to a high-wage classification is subject to verification at final audit, and payroll not shown to meet the threshold is assigned to the low-wage code by default. Certified payroll on public jobs is the strongest evidence an underground contractor has; on private work, the wage records have to be clean enough to compute regular hourly wage to the plan's definition. Our audit disputes handbook covers the dispute path when the audit comes back wrong.
Earthwork dual-wage FAQ
What is the 2026 dual-wage threshold for California excavation (6218)?
$45.00, up from $40.00, for policies incepting on or after September 1, 2026. At or above $45.00 the payroll goes to 6220; below it, to 6218. Grading land and land leveling carry the same figure.
Why do some broker tables still show these as TBD?
They were published while the filing was pending and never updated. The WCIRB's Quick Reference Guide lists excavation, sewer, and water or gas mains at $45.00, approved effective September 1, 2026.
Are sewer and water main construction the same class code?
No. Sewer construction is 6307/6308; water mains or connections is 6315(1)/6316(1) and gas mains or connections is 6315(2)/6316(2). Same $45.00 threshold, different classifications — and the policy has to reflect the work actually performed.
Is the $45 threshold applied to the crew or each employee?
Each employee, individually, as a cliff. An operator at $44.99 has all of their payroll in the low-wage code; at $45.00, all of it in the high-wage code. No averaging.
Placing a California site or underground contractor
CPR Business Solutions is a wholesale workers' comp MGA placing hard California construction risk since 2021 — elevated mods, shock losses, prior lapses, and classification-heavy site work. Send the ACORD 130, five years of loss runs, the mod worksheet, and a wage report, or submit the account.
Call 714-928-3858 or email proposals@cprbrokers.com to talk through a California account.
Related California class code guides: the full class code lookup table · roofing 5552 vs 5553 · carpentry 5403 vs 5432 · steel framing 5632 vs 5633 · wallboard and drywall 5446 vs 5447 · glaziers 5467 vs 5470 · plastering and stucco 5484 vs 5485 · electrical 5190 vs 5140 · masonry 5027 vs 5028 · sheet metal and ductwork 5538 vs 5542 · painting 5474 vs 5482 · concrete 5201 vs 5205 · fire sprinkler 5185 vs 5186 · plumbing and HVAC 5183 vs 5187 · the six finish and mechanical trades overview · the dual-wage threshold tracker.
