A failed perc test or unfavorable soil evaluation can change a mobile home land plan, but the phrase alone does not provide a final answer about the parcel. The specific evaluation, proposed use, local review, and available options still matter, and the same rules apply whether the paperwork says mobile home or manufactured home.
Short answer: Do not interpret the result from a short summary or property listing. Ask the county or environmental health office what was evaluated, whether records exist, what the result means for the proposed home and bedroom count, and whether any further public-sewer or qualified septic review is appropriate.
Reviewed by a manufactured home setup contractor and dealer.