Castle Rock Colorado Well Depth, Yield, and Cost

How deep are wells around Castle Rock?

How much water do wells make near Castle Rock?

Castle Rock well depth: plan for a deep hole

The median permitted well near Castle Rock is 500 feet deep. The middle half runs from 267 to 725 feet, so a bid based only on the median can miss the local range. Thirty-four percent of reported depths fall between 300 and 600 feet, while 39% are deeper than 600 feet. The deepest record reaches 2,956 feet.

Depth is driven by the aquifer and the location of the lot, not simply by distance from downtown Castle Rock. Permits identify 1,496 wells in unnamed or fractured-bedrock aquifers, 677 in the Lower Dawson, and 535 in the Denver aquifer. All reported aquifer wells are in the Denver Basin system. A driller should review nearby completions before setting a target depth.

What Castle Rock wells typically produce

Among the 1,156 records that report pump yield, the median is 12.0 gallons per minute and the middle half is 10.0 to 15.0 gallons per minute. Sixty-seven percent report yields from 5 to 15 gallons per minute, and 33% report more than 15 gallons per minute. No reported wells fall under 1 gallon per minute, while 1% fall between 1 and 5 gallons per minute.

These figures are useful for comparing lots, but a permit record is not a guarantee of a new well’s production. Yield testing, storage capacity, household demand, and the legal use of the well all matter. Many permits are for domestic or household use, while others serve stock, irrigation, or monitoring purposes.

Castle Rock water levels and the recorded trend

The median static water level is 370 feet below the ground surface, with the middle half from 195 to 571 feet. In plain terms, a pump and well system may need to lift water a long distance even when the well produces a useful flow rate. The finished design depends on the measured water level, pumping level, well depth, and pressure requirements.

The decade series does not show a simple steady decline. Median depth to water was 205 feet in the 1970s, 510 feet in the 1980s, 420 feet in the 2010s, and 370 feet in the 2020s. Only 195 records report static water levels, so treat the series as a local record summary rather than proof of a basin-wide trend.

Who drilled near Castle Rock, and when

Colorado DWR records show 3,469 permitted wells within the study area. Of those, 1,762 are recorded as constructed, 1,957 report a total depth, and 1,156 report a pump yield. The newest permit year in the records is 2025, so this is an active and continuing well area rather than a location represented only by older construction.

Hier Drilling Co Inc. with Bruce A. Hier appears most often, with 973 records. Hier Drilling Co. with Peter J. Hier appears on 282, and records marked Authorized (Pe, Pg) appear on 165. Those counts describe permit records, not a recommendation or proof that a driller is available for a new project. Ask for current licensing, insurance, references, and a written completion estimate.

Castle Rock well drilling cost at local depths

The local cost model uses a typical drilling rate of $50 to $70 per foot in Denver Basin sedimentary bedrock. At the 500-foot median depth, the drilled hole is estimated at about $25,000 to $35,000. A finished system, including the pump, tank, trenching, and electrical work, is estimated at about $31,000 to $47,000.

That range is a planning figure, not a guaranteed proposal. A deeper-than-median hole, difficult access, casing and grout requirements, pressure equipment, longer utility runs, or a dry hole can change the final price. Get the driller to separate drilling, completion, pump installation, storage, trenching, electrical, testing, and any unsuccessful-hole terms.

Risks to check before building near Castle Rock

Low yield is not the only concern. A well can encounter a different aquifer, require more depth than nearby wells, or fail to produce enough water for the planned use. Fractured-bedrock sections are especially unpredictable because nearby wells may not behave alike. Confirm casing and grout specifications, pump sizing, water testing, and the legal permit conditions before closing.

Environmental screening also deserves attention. The mapped area within about 10 miles includes 27 PFAS sampling or contamination sites, 26 historic mine features, and 14 EPA Superfund or cleanup sites. These mapped sites do not prove contamination at a particular parcel, but they justify a site-specific water test and review of nearby land uses. Septic location, replacement area, well setbacks, driveway access, and building envelopes should be checked together.

Buying or building a lot in the Castle Rock area

Start with the exact parcel, not a general Castle Rock average. Pull nearby permits and compare depth, aquifer, reported yield, static water level, well use, and construction status. Castle Pines Village, Franktown, Castle Pines, The Pinery, Sedalia, and Stepping Stone can provide useful nearby context, but conditions can change across short distances.

For a purchase, make water availability and well inspection part of the contract review. For a new build, obtain a driller’s site-specific estimate before finalizing the house plan, septic layout, driveway, or utility route. Confirm whether the permit is for exempt household use or another use, and check augmentation requirements if the property is in an over-appropriated basin. A strong nearby record improves planning; it does not replace a new-well evaluation.

Well permits by decade near Castle Rock

What a new well costs in Castle Rock, CO

How this is built: the median permitted depth here times the per-foot range for this ground, plus the normal system costs. A lot at the 75th-percentile depth (725 ft) would run roughly $42,250–$62,750. See the full Colorado well cost guide.

Environmental sites mapped within about 10 miles

Counts come from EPA, USGS and state datasets layered on the Colorado Well Finder map. A count is not a verdict on any one well; it tells you what to test for.

Buying land near Castle Rock? Know what it costs to build before you buy the dirt.

A listing photo can't tell you whether a lot is a dream or a money pit. Two parcels near Castle Rock can carry the same asking price while one needs an $80,000 driveway and a $45,000 engineered septic the other doesn't. The well numbers on this page are the start of that answer. A Tri-Lakes Site Feasibility Report is the rest of it: a licensed general contractor, excavator and septic installer reads the parcel the way we would if we were about to build on it, and puts the real cost in writing before your money is committed.

Spend a little to know. Or gamble a lot to guess. Realtors sell the view and inspectors look at houses that already exist. We're the people who'd build it, so we catch what quietly turns a "great deal" into a budget disaster: bad access, buried rock, steep grade, soil that won't pass for a normal septic, water that's a fortune to reach. And if the lot is good, you've already got a builder ready to do the work, driveway to drywall.

• Instant Online Report, $99 — type the address and get a buildability read on the spot: parcel, terrain and slope, soil and septic outlook. Cheap enough to run on every lot you're shopping.
• Desktop Report, $500 — a contractor's from-the-desk feasibility read: Regulation 43 and county code, GIS parcel data, terrain, flood and drainage, soil and septic viability, setbacks and buildable envelope, nearby well depths from our 591,000-well database, the likely driveway route, and a preliminary site-development cost breakdown.
• On-Site Report, $2,000 — everything above, then boots and a drone on the actual ground: house pad and septic zone located, access and winter conditions checked, rock and soil observed in person, a 15 to 20 page written opinion you can hand a lender or seller. Credited toward your project if you build with us.

Under contract, comparing parcels, or a realtor with a rural listing whose buyers keep asking "what will it cost to build here?" This is the due-diligence step almost everyone skips, and the one that saves the most.

Common questions about wells in Castle Rock

Keep researching

More in Douglas County

All wells in Douglas County — county-wide depth, yield and cost figures.

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