Two questions decide it
Parts of southern and western Chester County fall inside areas Rural Development has designated rural, and inside those areas a Section 502 guaranteed loan finances 100% of the purchase price. No down payment. That is the whole appeal, and it is real.
Everything after that follows from two pass-fail questions. Where is the house, and what does the household earn. Both get answered early, because either one can end the conversation, and the sequence matters: address, income, offer.
Check the map before you fall for the house
USDA runs its own property eligibility map, and that map is the only determination that counts. Its boundaries follow census geography. Township lines and eligibility lines are two different sets of lines and they cross each other all over the southern county, which is why eligibility can change one street over — one side of a road inside an eligible area, the houses facing it outside.
A listing description, a lender’s marketing page and a neighbor’s memory of a deal that closed in 2019 are all secondhand. The map is a live application and the areas get redesignated. So the address goes in first, a licensed Pennsylvania lender confirms the result, and the offer comes after. It takes a few minutes and it avoids the more expensive version of this conversation.
The income test counts the household
The guaranteed program is a moderate-income program, and the test looks at the household, including adults who will not be on the loan. The lender will tell you exactly whose income gets counted and which parts of it, because household income for eligibility and the income used to qualify you for the payment are two separate calculations.
Chester County sits in the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD MSA for USDA income purposes; that came off USDA’s own income tool, walked for Chester County on August 25, 2026. The dollar limit turns on household size and program area, and USDA revises it — the current guaranteed limits arrived under Procedure Notice 657, issued July 13, 2026 (Pennymac Announcement 26-82, July 2026). Ask for the figure in effect on the day your file is submitted.
What the site rule actually says
The property rules live in 7 CFR 3555.201, and they are more specific than most people expect:
- Loans are guaranteed only in areas Rural Development has designated rural.
- The site must be modest and developed to state and local standards.
- Site size must be typical for the area. The regulation sets no acreage cap.
- The site may not include income-producing land or buildings used principally for income production, and property used primarily for agriculture, farming or a commercial enterprise is ineligible. Vacant land with no eligible residential improvements is ineligible on its own.
- The site has to be contiguous to, and have direct access from, a hard-surfaced or all-weather street, road or driveway with enforceable maintenance arrangements. Shared gravel lanes are ordinary down here, and the rule wants the maintenance arrangement in writing.
- The site needs adequate utilities and water and wastewater disposal.
A barn that has held nothing but a lawn tractor for twenty years reads differently from a barn with a business in it.
Wells, septic and who is allowed to take the sample
Privately owned systems are fine on paper. Under 7 CFR 3555.201, a well and an on-lot septic are acceptable where the lender determines they are adequate, safe and compliant with applicable codes and connecting to a public or community system is not reasonable in cost or feasibility. The regulation also lets the Agency require inspections of those systems.
Locally, the Chester County Health Department is the authority underneath all of that. Its Rules and Regulations Chapter 500, section 501 (effective November 12, 2014) requires a county permit to construct a well, licenses the drillers and pump installers, and sets isolation distances — 100 feet from a sewage absorption area, 50 feet from a septic tank. Water samples must be drawn by a Pennsylvania DEP-certified laboratory employee or a county-licensed driller or pump installer and analyzed by a Pennsylvania-certified lab. The owner does not collect the sample. The full picture is in the wells, septic and Act 537 guide.
Fees, term, and what stacks on top
USDA charges an upfront guarantee fee, which can be financed into the loan, and an annual fee collected monthly across the life of the loan. USDA sets both by fiscal year, so ask the lender for the percentages in effect when your file is priced. The loan itself is a 30-year fixed for a primary residence, so no investment property, no rentals, no vacation houses.
There is also a Section 502 Direct program, where USDA is the lender itself. In USDA’s own words it “assists low and very-low-income applicants obtain decent, safe and sanitary housing in eligible rural areas by providing payment assistance to increase an applicant’s repayment ability” (eligibility.sc.egov.usda.gov, August 2026). It runs on different terms and a different application path.