# Wells in the All Unnamed Aquifers aquifer, Colorado — 465,783

> 465,783 Colorado well permits draw on the All Unnamed Aquifers aquifer, at a median depth of 125 feet.

## The All Unnamed Aquifers aquifer

**465,783** permits — 77.6% of the register — are recorded against this aquifer.

### What this aquifer is

the Division’s catch-all, and by far the largest group. It means the permit is not tied to one of the named Denver Basin formations.

Which aquifer a well draws on is not administrative detail: the
Denver Basin formations have their own legal regime, and alluvial water is
tied to the surface stream, which is why it is regulated differently. The
depth below is the practical consequence.

*Medians, on the permits where the Division was told — never a mean, which a few industrial wells would carry away*

| Measurement | Median | 90th percentile | Colorado median |
|---|---|---|---|
| Depth | **125 ft** | 478 ft | 148 ft — shallower here (297,182 permits, 64 %) |
| Yield | **10 gpm** | 15 gpm | 10 gpm — the same here (95,845 permits, 21 %) |
| Static water level | **45 ft** | 190 ft | 58 ft — lower here (226,401 permits, 49 %) |

### Where they are

| County | Permits | Share |
|---|---|---|
| [Jefferson](/county/jefferson.md) | 38,986 | 8.4% |
| [Weld](/county/weld.md) | 25,836 | 5.5% |
| [El Paso](/county/el-paso.md) | 23,916 | 5.1% |
| [Park](/county/park.md) | 22,015 | 4.7% |
| [Larimer](/county/larimer.md) | 18,805 | 4.0% |
| [Boulder](/county/boulder.md) | 18,315 | 3.9% |
| [La Plata](/county/la-plata.md) | 17,887 | 3.8% |
| [Adams](/county/adams.md) | 16,011 | 3.4% |
| [Pueblo](/county/pueblo.md) | 11,685 | 2.5% |
| [Garfield](/county/garfield.md) | 11,667 | 2.5% |
| [Grand](/county/grand.md) | 11,114 | 2.4% |
| [Teller](/county/teller.md) | 10,488 | 2.3% |
| [Denver](/county/denver.md) | 10,201 | 2.2% |
| [Fremont](/county/fremont.md) | 10,111 | 2.2% |
| [Chaffee](/county/chaffee.md) | 9,990 | 2.1% |
| [Arapahoe](/county/arapahoe.md) | 9,215 | 2.0% |
| [Douglas](/county/douglas.md) | 9,110 | 2.0% |
| [Gunnison](/county/gunnison.md) | 8,717 | 1.9% |
| [Morgan](/county/morgan.md) | 8,409 | 1.8% |
| [Summit](/county/summit.md) | 8,355 | 1.8% |
| [Logan](/county/logan.md) | 8,331 | 1.8% |
| [Yuma](/county/yuma.md) | 7,912 | 1.7% |
| [Las Animas](/county/las-animas.md) | 7,808 | 1.7% |
| [Rio Grande](/county/rio-grande.md) | 7,468 | 1.6% |
| [Routt](/county/routt.md) | 6,999 | 1.5% |
| [Custer](/county/custer.md) | 6,819 | 1.5% |

### What happened to these permits

**263,383** of the 465,783 permits on this aquifer ended with a
well the Division was told about — 56.5%. And
**78,015** expired without one: 16.7%.

An expired permit is the trap in a rural sale. A seller can
produce a permit that lapsed years ago, and a permit is not a water right
— the two are separate, and a purchase turns on both.
[What an expired permit does and does not mean](/expired.md).

| Status | Permits | Share |
|---|---|---|
| Well Constructed | 263,383 | 56.5% |
| Permit Expired | 78,015 | 16.7% |
| Well Abandoned | 34,196 | 7.3% |
| Permit Issued | 17,850 | 3.8% |
| Permit Canceled | 17,239 | 3.7% |
| Well Replaced - Abandonment Required | 14,374 | 3.1% |
| Application Denied | 13,572 | 2.9% |
| Application Information Requested | 9,566 | 2.1% |
| Application Received | 3,252 | 0.7% |
| NA | 2,539 | 0.5% |

### Buying land in Colorado, or need a well drilled?

465,783 well permits are on the Division’s register in Colorado, 78,015 of them expired. This site tells you what a permit says; it does not drill, and it is not advice on a water right. Tell us where and we pass the request to drillers and water-rights advisers working in Colorado.

We take no commission and we recommend no driller. We have no arrangement with any firm today — we are collecting these requests in order to go and find them. [What we do with this](/privacy.md).

### The other aquifers

- [Not stated](/aquifer/not-stated.md) 19,134
- [Dawson](/aquifer/dawson.md) 14,024
- [Denver](/aquifer/denver.md) 13,929
- [Alluvial](/aquifer/alluvial.md) 13,890
- [Ogallala](/aquifer/ogallala.md) 11,241
- [Arapahoe](/aquifer/arapahoe.md) 9,456
- [Laramie Fox Hills](/aquifer/laramie-fox-hills.md) 7,796
- [Upper Dawson](/aquifer/upper-dawson.md) 6,943
- [Quaternary Alluvium](/aquifer/quaternary-alluvium.md) 5,403
- [Lower Dawson](/aquifer/lower-dawson.md) 4,944
- [Unconfined San Luis Vall](/aquifer/unconfined-san-luis-vall.md) 3,975
- [Unconfined San Luis Valley Aquifer](/aquifer/unconfined-san-luis-valley-aquifer.md) 3,520
- [Laramie-fox Hills](/aquifer/laramie-fox-hills.md) 2,605
- [Confined San Luis Valley](/aquifer/confined-san-luis-valley.md) 2,551
- [Upper Arapahoe](/aquifer/upper-arapahoe.md) 2,224
- [Lower Arapahoe](/aquifer/lower-arapahoe.md) 2,084
- [Dakota](/aquifer/dakota.md) 1,758
- [Confined San Luis Valley Aquifer](/aquifer/confined-san-luis-valley-aquifer.md) 1,683

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Página: https://wells-co.pages.dev/aquifer/all-unnamed-aquifers/
Fonte: Well Application Permit — Colorado Division of Water Resources
Recolha: 2026-08-21