The Hidden Clock Behind Every Buildable Lot in Hollywood, MD

Scroll through vacant land listings in Hollywood, MD long enough and you start to notice a phrase doing a lot of quiet work: "perc'd and ready to build." Sometimes it sits next to a premium price. A few listings down, a similar wooded acre and a half reads "no perc test attempted" or "buyer to verify," often priced lower and framed as an opportunity. Most buyers read that difference as a formality, something the seller's agent handles before closing. It isn't. In St. Mary's County, whether your lot has already passed a percolation test can be the difference between breaking ground next spring and waiting until 2027.

That gap exists because of a regulation almost nobody reads until it costs them a year: Maryland's wet weather testing rule for septic systems.

The window state law actually gives you

Most of Hollywood sits outside the reach of public sewer. Unless a lot is served by public sewer, a new home needs an approved septic system, and before the county will approve a septic system, the lot has to pass a percolation test, commonly called a perc test, that measures how well the soil absorbs water.

Maryland's sewage disposal regulations don't let that test happen whenever a contractor is free. For soils classified as wet weather soils, the state's rule requires testing to occur when the water table is at its highest point of the year, generally between February 1 and April 15. Test too early or too late and the result doesn't reflect how the soil behaves during the wettest stretch of a typical year, which is exactly the condition a septic system has to survive. So the window can stretch in a soggy year or shrink to almost nothing in a dry one. Some years it barely opens at all.

That single fact reframes what a lot listing is really telling you. "Perc'd and ready" doesn't just mean the soil passed. It means someone already cleared the calendar hurdle that every untested lot in the county is still waiting on.

A pattern, not a fluke

St. Mary's County Health Department has suspended wet season perc testing early, before the calendar window would normally close, in four of the last five years.

The county's own announcement from this April confirms that anyone whose test wasn't already scheduled and completed by then is now waiting on next year's wet season, expected sometime in 2027. Applicants can request a refund, but doing so means losing their place in line and reapplying from scratch when testing resumes. Local coverage from the Southern Maryland Chronicle tied this year's early closure to broader drought conditions across the region, including the Potomac River running near record lows this spring.

Four suspensions in five years means the "normal" testing season, the one that runs comfortably from February to mid-April, is no longer the safe assumption. It's the outcome you get in a wet year. The early cutoff has become the more common result.

Two Hollywoods, one zip code

Not every lot in Hollywood is waiting on a perc test, and the split tells you something about how the town is actually built.

Along the Three Notch Road corridor and near intersections like St. John's Road, public water and sewer already reach some parcels. That infrastructure is exactly why a project like Villages at Clark's Mill, an 18-unit townhome development on 3.7 acres between Three Notch Road and Mervell Dean Road, could move forward with lots under a tenth of an acre each. The St. Mary's County Planning Commission reviewed the concept plan in March 2024, and that kind of density simply isn't possible on septic, which needs enough usable soil for a full drain field.

Step off that corridor and into the wooded, larger-acreage lots that make up most of residential Hollywood, and septic is the default. Those are the properties where "perced," "not perc tested," and "sewage plan on file" become the headline facts of the listing, more prominent than square footage or road frontage, because they determine whether the lot is buildable this year or next.

If you're comparing two lots in Hollywood and one is inside that sewer-served pocket while the other sits a half mile away in the trees, you're not just comparing land. You're comparing whether the county's groundwater cooperates with your timeline.

What "perc'd and ready" is actually buying you

A passed perc test isn't a formality closed out on a checklist. It's a specific, dated approval that the health department ties to that exact spot on the property.

• A licensed Maryland surveyor has to stake the test locations and submit a site plan for county review before testing can happen.
• A licensed St. Mary's County septic contractor must be on site at the same time as the health department, with the equipment to run the test.
• Once a plan with approved perc locations is on file, those locations remain good as long as regulations don't change, which means a passed test from two or three years ago can still be valid today.
• A satisfactory perc test still doesn't guarantee development rights on its own. Zoning, setbacks, and other agency approvals still apply, so a passed test is a necessary step, not the finish line.

That last point matters because it explains why sellers who have a passed perc test tend to price accordingly. They've already absorbed the calendar risk that an untested lot is still carrying.

Timing a build around a clock you don't control

Because the 2026 wet season closed on April 17, anyone holding an unscheduled application right now is waiting for a window that historically hasn't opened again until late January at the earliest, based on the resume dates from 2023 and 2024. That means a lot purchased today without a passed perc test could realistically sit untested through the fall and winter, with the earliest possible testing happening in early 2027.

If you're serious about building in Hollywood, that changes how you should shop. A slightly higher price on a lot with an approved perc test can be worth far more than the difference suggests, because it buys back a season, sometimes a full year, of waiting. If you do fall for an untested lot, ask directly what soil type it falls under and whether the seller has any prior test history on file. Lower terrace soils sometimes get cleared for testing earlier in the season than upland soils, which is exactly the kind of distinction that separates a builder-savvy buyer from one who finds out the hard way.

A few questions worth asking before you sign

What exactly does a perc test measure? It measures how quickly water moves through the soil at a specific spot on the property, which tells the county whether a septic drain field will function properly there year round, not just on a dry afternoon in July.

Does this only affect vacant land, or can it slow down a home that's already built? It's almost entirely a new-construction and expansion issue. Existing homes with functioning septic systems aren't retested unless the system fails or an addition requires more capacity.

What happens if a lot fails its perc test? Standard practice is to move to a sand mound test on the same property, since some soils that fail a standard drainfield test can still support a mound system. If both fail, the lot may not be buildable for a conventional home without significant engineering, which is worth knowing before you're under contract, not after.

If you're weighing a lot in Hollywood, or trying to figure out whether that "perc'd and ready" listing is actually worth the premium, I'd rather walk through the specifics with you before you commit to anything. Reach out to Laura Bernth at Hammer & Heels Realtor for a straight read on a specific parcel, and if you've got a home to sell before you build, start with a free instant home valuation to see where you stand.