Wells, Septic & Sump Pumps
~10 min read · Know what a general SOP covers at private systems and which indicators trigger referral.
Private water and waste systems sit mostly outside the general home inspection's scope — but the inspector still reports what's visible, runs the functional basics, recognizes failure evidence, and writes the referral lines that protect everyone.
Wells: what the generalist covers
Visible/functional scope: the wellhead (cap sealed and above grade, casing sound, gap-free — surface water entering the casing contaminates the aquifer), setback PRINCIPLE from septic and contamination sources (specific distances are local), the pressure tank and switch (short-cycling — pump kicking rapidly — means a waterlogged tank or failing controls), observed functional flow across fixtures, and staining evidence (iron, sulfur odor). Explicit exclusions to state: water quality/potability testing (recommend lab testing — bacteria, nitrates, plus local concerns), yield testing, and pump/component evaluation — well-contractor referrals.
- Wellhead: sealed cap, sound casing, above grade
- Short-cycling = tank/control finding
- Potability and yield: recommend testing — outside SOP
Septic: evidence reading
The generalist walks the field and reads: surfacing effluent or persistent lush green stripes over the drainfield (failure evidence), sewage odors outside, backups or gurgling at the house's lowest fixtures, tank lids (condition, at-grade risers, secured against entry — an unsecured lid is a drowning hazard), and gray-water shortcuts discharging to the surface. History questions (pumping records, age) inform the referral. Excluded and referred: tank opening, pumping, load/dye testing — septic-inspection referral is standard at every sale involving one.
- Green stripes, soggy ground, odors = drainfield failure evidence
- Lowest-fixture backups and gurgles
- Unsecured lids are safety findings; full evaluation referred
Sumps and ejectors
Interior pumps get functional attention: sump pumps (lift the float — it should run; check the check valve, discharge destination away from the foundation, and lid), sewage ejectors (sealed basin, vented, alarm presence), and battery backup notes. Discharge routed to the septic system or to the sanitary sewer where prohibited is a reportable configuration issue.
Worked example
A rural listing: the wellhead's cap sits loose in a low spot that clearly ponds; inside, the pump kicks on-off-on rapidly while a faucet runs; out back, a vivid green stripe crosses brown late-summer lawn over the drainfield, and the septic lid is a loose piece of plywood; no pumping records exist. Structure the report and referrals.
Well side: a loose cap in a ponding depression is a direct contamination path into the casing — seal/raise (grade correction) finding, PLUS the standard potability-testing recommendation (now with cause); the rapid cycling marks a waterlogged pressure tank or failing switch — well-contractor evaluation. Septic side: the green stripe on a dry lawn is effluent fertilizing the surface — drainfield failure evidence; the plywood lid is an immediate CHILD-SAFETY hazard (secure now); no records plus evidence = full septic inspection referral before closing, with the buyer told failure can mean five-figure replacement. The generalist's product: visible evidence, functional observations, two safety items, and referrals that put specialists where they belong.
Common exam pitfalls
Implying potability from clear water.
Clarity proves nothing — lab testing is the only potability evidence; recommend it explicitly every time.
Reading the lush stripe as healthy lawn.
Green over the drainfield in dry season is effluent surfacing — failure evidence, not landscaping success.
Exceeding scope by 'testing' the septic.
Tank opening, dye and load tests belong to septic professionals — the generalist reports evidence and refers.
Cap it, test it, watch the cycles; and a green stripe on a brown lawn is the field confessing.
Recap
- Wellhead integrity and grading; short-cycling findings
- Potability and yield: recommend testing, refer components
- Septic: surface evidence, backups, lid safety
- Full septic evaluation referral at sale
- Sump/ejector function, discharge destination, lids
- State scope limits explicitly
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