Rockland County's Private Well Testing (PWT) Law, Explained

What the law requires, and why a mail-in kit doesn't work

Rockland County Code Chapter 389, "Wells," adopted in 2004 and 2005, requires that upon the signing of a contract of sale for any property served by a private water system in the county, the seller must cause a water test to be performed and obtain written certification from a New York State-approved laboratory that the water conforms to Rockland County's water standards. The critical procedural detail: the sample has to be collected by an employee or authorized representative of a New York State-certified laboratory itself -- not the homeowner, not a real estate agent, and not a generic mail-in home test kit. A test that doesn't follow this specific chain-of-custody requirement won't satisfy the law, even if the underlying water quality is fine.

When testing is required -- more triggers than just a sale

The PWT Law's testing requirement isn't limited to a one-time sale. It applies to: a newly constructed well; any property transfer or sale; rental properties, which must be retested every five years or whenever the property is sold; and any well -- new or existing -- that hasn't been used for a period of five years before being put back into service. For a landlord or a buyer of a rental property specifically, this means well testing is a recurring compliance obligation, not a one-time closing-day formality.

Test results are valid for one year. If a sale process drags on past that window, expect to need a retest before closing rather than relying on a test performed too far in advance.

Cost, who pays, and the closing-time paperwork

The county's own cost estimate for PWT-compliant testing runs roughly $400 to $450, and the seller is responsible for arranging and paying for it -- factor this into closing costs on the sell side rather than assuming it's a buyer expense or a negotiable line item. At consummation of the sale, an affidavit substantially complying with the form in the law's own Appendix A -- certifying that testing has been or will be completed on the schedule set out in the law -- has to be filed with the Rockland County Health Department. This is a specific compliance document distinct from the lab's own water-quality report.

What this means if you're buying or selling well-water property in Rockland County

If you're selling a well-served property in Rockland County, arrange certified-lab testing as soon as you have a signed contract of sale, since the law's chain-of-custody requirement means you can't shortcut this with a kit ordered online, and budget the roughly $400-450 cost as a seller expense. If you're buying, confirm the seller has arranged (or is arranging) compliant testing rather than accepting a homeowner-collected sample or an out-of-window result, and ask specifically whether the well has ever sat unused for five or more years, since that independently triggers the testing requirement regardless of the sale itself. If you're evaluating a rental property, check when it was last tested under the five-year rental cycle before assuming its water-testing compliance is current.