What is an MCS-90 endorsement, and does my oilfield truck need one?

The MCS-90 is the "Endorsement for Motor Carrier Policies of Insurance for Public Liability" under the Motor Carrier Act of 1980. Its key promise: the insurer agrees to pay, within the limits stated, "any final judgment recovered against the insured for public liability resulting from negligence in the operation, maintenance or use of motor vehicles" subject to the federal rules, "regardless of whether or not each motor vehicle is specifically described in the policy."

It also says no "condition, provision, stipulation, or limitation contained in the policy" relieves the insurer from paying that judgment. That is what makes it powerful: an unlisted truck, a late notice, an excluded driver. The insurer still pays the injured public.

Then the catch. "The insured agrees to reimburse the company for any payment made by the company on account of any accident, claim, or suit involving a breach of the terms of the policy, and for any payment that the company would not have been obligated to make under the provisions of the policy except for the agreement contained in this endorsement."

The Fourth Circuit described it as creating "a suretyship by the insurer to protect the public." It is not extra coverage for your business.

Under 49 CFR 387.3, the financial responsibility rules apply to for-hire motor carriers hauling property in interstate or foreign commerce, and also to carriers hauling hazardous materials, substances or wastes, including some intrastate moves. Vehicles under 10,001 pounds GVWR are generally excluded, except for certain high-hazard materials. Non-bulk oil and non-bulk hazmat moved intrastate are excluded.

Proof of the required coverage is the MCS-90 (from an insurer) or an MCS-82 surety bond, kept at the carrier's principal place of business under 49 CFR 387.7.

Most oilfield service contractors move their own equipment and crews to locations. If you are not hauling for hire across state lines and not hauling oil or hazmat, the federal MCS-90 requirement may not reach you at all. That changes when:

• You cross state lines for hire, for example running loads into New Mexico or Louisiana on someone else's freight.
• You haul oil or hazmat. The $1M row covers oil listed in the federal hazmat table in any quantity interstate, or in bulk intrastate. Whether a specific load qualifies depends on what is in it and how the shipper classifies it, so check the shipping papers.
• You haul in a cargo tank. Certain bulk hazardous substances carry the $5M minimum even intrastate.

Water hauling contractors should look at what they actually haul, since produced water and the materials mixed with it are not all classified the same way. See also pollution coverage for produced water.

Texas has its own operating authority for intrastate carriers. TxDMV guidance says registration is required if you operate a vehicle or combination with a gross weight, registered weight or gross weight rating over 26,000 pounds, or transport hazmat in a quantity that requires placarding, among other triggers. Registered carriers must keep evidence of insurance on file with TxDMV.

TxDMV lists $500,000 as the minimum for private or for-hire carriers over 26,000 pounds, with higher minimums ($1,000,000 or $5,000,000) for oil and hazardous materials depending on the commodity. Federal and Texas filings are separate, so a Texas-only operation can owe a TxDMV filing without an MCS-90, and a carrier doing both may need both.

Operators and their compliance platforms usually care less about the MCS-90 itself and more about the auto limit, the vehicle symbol, and whether hired and non-owned autos are included. If you haul, expect them to look at your federal and Texas filings as well. The broader picture is on our oilfield auto insurance and MCS-90 page, and what limits operators require covers the auto limit side.