It is apparent you don't, or at least I hope you don't perform FHA appraisals or you would know "grandfathering" is not allowed per FHA, instead the property must either meet FHA minimum property requirements OR be updated to meet them in order for the loan to fund.
In this case the property did not and cannot physically meet the distance requirements on septic and well to qualify for an FHA loan which was not determined because of the APPRAISERS failure to report the system.
The APPRAISER is the only person required to determine and disclose property specific characteristics that determine eligibility to the lender.
You make me question the entire appraisal industry.
See below for your obvious CE needs.
"Grandfathering" is not the relevant issue here. Compliance with Minimum Property Requirements is the issue. This property fails MPR. Just report the condition. The DEU will decide if correction is feasible. If not, they will reject the property.
See HUD Handbook 4000.2
2-6 GENERAL ACCEPTABILITY STANDARDS FOR PROPERTY. There are minimum property standards for existing and proposed construction. A property is considered "existing construction" if it was completed more than one year prior to application. See HUD Handbooks 4905.1 and 4910.1 for additional information on existing and proposed construction, respectively.
Underwriters bear primary responsibility for determining eligibility of a property for FHA mortgage insurance. However, the FHA appraiser is the on-site representative for the Mortgagee and provides preliminary verification that these standards have been met. The “Notice to the Lender” requires the FHA appraiser to report the physical conditions that are readily observable on the date of the site visit and to detail the repairs needed to establish and/or maintain the marketability of the property, protect the health and safety of the occupants, and protect the security of the property. These criteria must be addressed by the Mortgagee before closing.
When examination of existing construction reveals noncompliance with the General Acceptability Criteria, an appropriate specific condition to correct the deficiency is required if correction is feasible. If correction is not feasible and only major repairs or alterations can effect compliance, the Mortgagee will reject the property.