Replacing an old well: signs, sequence, and the rules

A drilled well is a 30–50+ year asset, but the system around it isn't. The art of the "my water stopped" phone call is telling pump problems (fixable, cheaper) from well problems (declining yield, collapsing casing, chronic contamination) — and knowing when replacement beats rehabilitation.

Signs, sorted

Probably the pump or tank: pressure cycling rapidly (waterlogged tank), sudden total loss (dead pump, tripped breaker, failed switch), air spitting after pump replacement (drop pipe leak).

Probably the well: gradual pressure loss over months (falling water table or clogging screen), sediment that arrives with heavy pumping (bore or casing trouble), recurring bacteria hits despite disinfection (surface leakage past old casing), a well that recovers slowly after moderate use (declining fracture yield).

Age alone: a pre-1980 bored or hand-dug well — wide, shallow, weakly sealed — is a candidate for replacement on sanitary grounds even while it still "works."

Rehab options before drilling new

• Clean and redevelop — brushing, surging, or jetting a clogged screen can restore a sand-aquifer well.
• Hydrofracking a rock well that faded.
• Deepen the existing bore where the rig can re-enter and the casing is sound.
• Liner through a corroded steel casing section.

A straight answer on rehab-vs-replace requires the original construction report — depth, casing, static level, yield at completion. That report is a public record in most states; we've indexed millions of them, so look up your area and often the original well itself.

If it's replacement

The new well is a normal permit-and-drill job (see permits by state) with one addition: siting must clear the septic system, property lines and the old well.

You can't just walk away from the old one

Every state has abandonment rules, because an open bore is a direct contamination channel into the aquifer — and a physical hazard. The pattern is consistent: the old well must be decommissioned — pumped equipment removed, bore filled with approved material (typically neat cement, bentonite grout, or specified aggregate in sequence), and in most states a decommissioning/abandonment report filed, usually by a licensed contractor. Several states fold this into the same forms and portals as construction reports; some counties inspect the sealing. Skipping it can surface at resale, and in contamination cases it surfaces in court.

Budget shape

Replacement usually costs a bit more than a first well on the same lot would: the drilling and system are the same, and decommissioning the old bore adds several hundred to a couple thousand dollars depending on depth and access. The consolation: you already know the geology — your own old well is the best depth predictor on the street.