What to Expect from a Well in Costilla County

How deep are wells around Costilla County?

How much water do wells make near Costilla County?

A 170-Foot Median Is a Starting Point, Not a Bid

Of the 2,615 wells reporting depth, the median is 170 feet and the middle half is 100–280 feet. For a buyer, that means a bid built around the median needs room for additional drilling. The 90th-percentile depth is 400 feet; the deepest reported well reaches 1325 feet.

The cost model describes mixed sedimentary and alluvial ground. Permit aquifer labels are less specific: 3,818 fall under unnamed / fractured-bedrock aquifer, while other records identify the unconfined San Luis Valley aquifer. That broad unnamed category does not establish the geology beneath a particular lot. Compare nearby completion logs and the water-bearing materials encountered rather than treating the county median as a target depth.

Reported Yields Usually Support a Household Conversation

The 1,108 records with pump yields show a median of 10.0 gpm, with the middle half at 7.0–15.0 gpm. Those results are encouraging for household planning, but a reported pump yield is not a guarantee of sustained production or permission to use water outdoors.

Only 1% of reported yields are under 1 gpm, while 8% fall in the 1–5 gpm band. Low-output wells are therefore a real concern even though they are not typical of the reported sample. Before buying an existing well, request a pumping and recovery test. If output is limited, have the contractor evaluate storage and household demand rather than simply installing a larger pump.

Costilla Water Levels Do Not Show a Clear Declining Trend

Static water level means the depth to water when the well is at rest, not the total drilled depth. Among 532 reporting wells, the median is 80 feet below ground, and the middle half is 45–160 feet. A pump still needs to be selected around pumping conditions, not just that resting level.

Median measured levels were 85 feet in the 1970s, 80 feet in the 2010s and 88 feet in the 2020s. These figures do not establish a steady countywide decline. They also are not repeated measurements from an identical set of wells. For a property decision, recent measurements and recovery behavior at the actual well carry more weight.

Permit Activity and Drillers in the County Record

Costilla County's records include 336 permits issued in the 1970s, 669 in the 1990s and 762 in the 2010s. The 2020s contain 625 permits, with the newest permit year listed as 2025. Permit issuance shows activity, not proof that every authorized well was completed.

The most active drillers listed are Heersink Drilling (Heersink, Scott), with 375 records; Mitchell Drilling Co. (Mitchell Jr., John C.), with 337; and Ojo Spring Drilling & Well Service (Blouin, Octave George), with 230. These are historical record counts, not confirmation of current availability. When seeking bids, ask about experience near your parcel and request an explanation of the neighboring completion logs.

Budget Beyond the Drilled Hole in Costilla County

The local model uses $50–$75 per foot for mixed sedimentary and alluvial ground. At the 170-foot median depth, the drilled hole is about $8,500–$12,800. A finished well with pump, tank, trenching and electrical is modeled at $14,500–$24,800.

Treat those amounts as planning figures, not a parcel-specific quote. A deeper completion, difficult access or a longer utility route can change the scope. Ask bidders to spell out casing, grout, testing and what happens if drilling does not produce usable water. The 100–280-foot middle-half depth range is a good reason to request clear per-foot pricing and a written allowance for work beyond the initial estimate.

Check Water Quality and Site Constraints Before Closing

The environmental map identifies 6 PFAS sampling/contamination sites and 7 historic mine features within about 10 miles. It lists 0 EPA Superfund/cleanup sites in that search area. These are screening results: proximity does not establish contamination in a well, and the absence of a cleanup listing does not establish safe drinking water.

Have a laboratory test the property's water and discuss additional testing with local health officials based on nearby features. Review casing, grout and the wellhead's protection from surface drainage. For vacant land, coordinate the well location with septic approval, the building site and drilling access. Productive neighboring wells help assess risk, but they cannot guarantee a successful hole on your parcel.

Buying Near Blanca or San Luis: Verify the Actual Permit

Before closing on land near Blanca, San Luis, Fort Garland or San Acacio, match the parcel to its DWR permit and available completion records. Verify the permitted uses rather than relying on a listing that says “domestic well.” An exempt household-use permit does not automatically authorize irrigation, livestock watering or every proposed use.

Water availability and legal permission are separate questions. In over-appropriated basins, some proposed uses may require augmentation; confirm the applicable requirements with DWR before designing the project. Then compare nearby depths and yields, obtain a site-specific drilling estimate, and lay out access, septic and utilities together. An existing permit alone is not evidence of a completed, serviceable water supply.

Well permits by decade near Costilla County

What a new well costs in Costilla County

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 (280 ft) would run roughly $20,000–$33,000. 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 Costilla County? 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 Costilla County 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 Costilla County

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