Source policy
Each completed state integration uses a documented public source: an agency feed or a published historical inventory. Source dates and household, agricultural or public-supply coverage remain visible. WellLookup preserves the source name, source link and state-specific coverage limitation, and does not create replacement values when the source leaves a field blank.
Different states publish different record types and location precision. A nearby public point is useful evidence for research, but it is not presented as a guaranteed parcel-to-well match.
Read how WellLookup normalizes and compares records →
Compare state record coverage
Source type and age matter as much as the presence of a map point. Open a state to see actual record examples, its verification steps and the original source. Review dates show when examples were retrieved, not when wells were drilled or inspected.
| State | Source type | Source period | Important limitation | Examples reviewed |
|---|---|---|---|---|
| Alabama | Published agency index | Dates vary by filing | Digital records are incomplete relative to the full hardcopy collection; additions are ongoing. | October 23, 2026 |
| Alaska | Published agency index | Dates vary by filing | WELTS data is provisional and location precision varies from GPS or parcel placement to broader survey-area centroids. | October 23, 2026 |
| Arizona | Published agency index | Dates vary by filing | Registry records vary by filing type and completeness; nearby registry points should be verified against the original state record. | October 23, 2026 |
| Arkansas | Historical snapshot | 2022-11-28 | Published domestic-well records collected in November 2022. Historical coverage is incomplete; current condition, operating status and property association require verification. | October 23, 2026 |
| California | Published agency index | Dates vary by filing | DWR's statewide OSWCR index includes well-completion reports and construction/yield fields. DWR notes that missing, duplicate or incorrect values can occur and many mapped locations are PLSS section-center approximations; verify the original report. | October 23, 2026 |
| Colorado | Published agency index | Dates vary by filing | The public DWR permit layer includes permit status, well depth, yield, static water level, aquifer/use context, construction dates and location accuracy where available. | October 24, 2026 |
| Connecticut | Published agency index | Dates vary by filing | Water-supply completion reports submitted online since January 1, 2021. Older paper records and geothermal/abandonment report types are excluded. Yield-test methods vary and locations require verification. | October 23, 2026 |
| Delaware | Published agency index | Dates vary by filing | Active or completed domestic well records with published locations. Proposed, voided and abandoned permits are excluded; location accuracy and historical completeness vary. | October 23, 2026 |
| Florida | Historical snapshot | 2021-2022 | Domestic records with reported completion years from a 2021-2022 compilation. Usable mapped coverage is concentrated in northern Florida. Application depths are labeled planned and excluded from recorded-depth statistics. Other regions have limited coverage. | October 23, 2026 |
| Georgia | Non-household context | 2022-09-16 | These records provide agricultural context. This source does not provide a household-well inventory. | October 23, 2026 |
| Hawaii | Historical snapshot | 2023-03-01 | Published domestic-well locations collected in March 2023. This release has no well depths, construction years or test yields. It is a historical location inventory, with incomplete coverage and unverified current status. | October 23, 2026 |
| Idaho | Published agency index | Dates vary by filing | Statewide well records include permits, construction, depth, static water level, production rate and source documents where available. Older records and individual fields can be incomplete; verify mapped locations against the original report. | October 23, 2026 |
| Illinois | Published agency index | Dates vary by filing | ILWATER records explicitly classified as private, semi-private or household/livestock water wells. Engineering borings and unclassified or other-use records are excluded; historical locations and missing fields vary. | October 23, 2026 |
| Indiana | Published agency index | Dates vary by filing | The statewide inventory includes directly located and estimated well locations, so proximity alone does not establish parcel association. | October 23, 2026 |
| Iowa | Published agency index | Dates vary by filing | The public facility layer includes private well permits, testing registrations, abandoned-well registrations and renovation records, with mapped locations and well depth where available. | October 23, 2026 |
| Kansas | Published agency index | Dates vary by filing | Many well coordinates are derived from legal descriptions rather than surveyed wellheads, and structured field completeness varies by record. | October 23, 2026 |
| Kentucky | Published agency index | Dates vary by filing | KGS publishes mapped water-well records with depth, static water level, use and construction context; Kentucky did not require well registration before 1985, so older coverage can be incomplete. | October 23, 2026 |
| Louisiana | Published agency index | Dates vary by filing | Active domestic water-well registrations. Oil/gas, monitoring, irrigation and abandoned wells are excluded. Older unregistered wells may be missing; reported yield is historical and is not a current supply guarantee. | October 23, 2026 |
| Maine | Published agency index | Dates vary by filing | Located wells include coordinates, depth, yield, static level, construction and well type; location accuracy varies. | October 24, 2026 |
| Maryland | Historical snapshot | 2022-08-08 | Published domestic-well inventory collected in August 2022. Missing details and possible source duplicates remain marked; historical coordinates and current operating status require verification. | October 23, 2026 |
| Massachusetts | Published agency index | Dates vary by filing | The April 2023 viewer dataset contains vetted, geolocated Well Completion Reports, including multiple well types. It is a subset of the full Well Driller Database; a mapped point may identify a parcel rather than an exact wellhead. | October 23, 2026 |
| Michigan | Published agency index | Dates vary by filing | More than 575,000 spatially verified records are published; pre-2000 coverage varies by county. | October 23, 2026 |
| Minnesota | Published agency index | Dates vary by filing | The public index contains location, depth, geology, construction and static-water information for many Minnesota wells and borings; missing records do not prove no well exists. | October 30, 2026 |
| Mississippi | Published agency index | Dates vary by filing | The public layer is a November 2024 statewide snapshot with limited published attributes; it is not presented as a continuously updated registry. | October 23, 2026 |
| Missouri | Published agency index | Dates vary by filing | Statewide certified well records published as a 2022 MSDIS snapshot. Older and pre-certification wells can be incomplete, and this snapshot is not presented as a live daily registry. | October 23, 2026 |
| Montana | Published agency index | Dates vary by filing | GWIC records include multiple borehole and site types and vary in completeness and positional accuracy. | October 23, 2026 |
| Nebraska | Published agency index | Dates vary by filing | The registered-well inventory includes well status, use, depth, water levels, pumping and registration fields where available. Active and decommissioned wells must be distinguished, and mapped proximity does not establish parcel association. | October 23, 2026 |
| Nevada | Published agency index | Dates vary by filing | Public well-driller reports include construction and pump-test fields; mapped locations and historical values should be verified against the original report. | October 23, 2026 |
| New Hampshire | Published agency index | Dates vary by filing | Mapped NHGS inventory entries include WRB identifiers and OneStop record links, historical construction, tested yield and location-quality fields. Coverage and record precision vary; a nearby point does not confirm a property match. | October 24, 2026 |
| New Jersey | Non-household context | 2023-01-11 | These records provide irrigation context. This source does not provide a household-well inventory. | October 23, 2026 |
| New Mexico | Published agency index | Dates vary by filing | September 1, 2026 OSE inventory of explicit domestic wells with recorded depth; surface diversions and plugged wells are excluded. Estimated yield is excluded from pumping-rate comparisons. The state database remains incomplete. | October 23, 2026 |
| New York | Published agency index | Dates vary by filing | Registered driller completion reports have been collected since April 2000; mapped locations are generally parcel-scale and may not be the exact wellhead location. | October 23, 2026 |
| North Carolina | Non-household context | 2022-03-18 / 2023-01-10 | These records provide public-supply and agricultural context. This source does not provide a household-well inventory. | October 23, 2026 |
| North Dakota | Historical snapshot | Imported October 11, 2026 | Statewide DWR domestic and domestic/stock records imported October 11, 2026. Explicit site/log links are reconciled. Many construction details remain in original scanned logs; historical coordinates can be approximate. | October 23, 2026 |
| Ohio | Published agency index | Dates vary by filing | Mapped well records include depth, completion date, test rate, static water level and aquifer context; only records with known coordinates appear on the map layer. | October 23, 2026 |
| Oklahoma | Published agency index | Dates vary by filing | The public groundwater-well layer includes well ID, permit, county, construction date, total depth, first water, approximate yield, aquifer and source links where available. | October 23, 2026 |
| Oregon | Published agency index | Dates vary by filing | Public well reports include depth, yield, static-water, use and drilling fields; many historical locations are mapped from survey descriptions rather than exact wellheads. | October 23, 2026 |
| Pennsylvania | Published agency index | Dates vary by filing | Public PaGWIS points include well location, use, depth, reported yield and data-reliability fields; public-water supplies are excluded. | October 24, 2026 |
| Rhode Island | Historical snapshot | 2022-09-06 | Published mapped domestic records collected in September 2022. This is a small, incomplete historical subset; many locations were matched approximately from addresses. Absence of a point does not mean absence of a well. | October 23, 2026 |
| South Carolina | Historical snapshot | 2023-03-02/03 | Published domestic records for the Coastal Plain and Piedmont, collected in March 2023. Both inventories are incomplete. Historical depth and construction fields are available where reported; locations require verification. | October 23, 2026 |
| South Dakota | Published agency index | Dates vary by filing | Public well-log records include mapped location, depth, completion, driller, aquifer and static-water fields; location accuracy varies by record and should be verified against the source log. | October 23, 2026 |
| Tennessee | Historical snapshot | 2023-01-06 | Published domestic-well records collected in January 2023. This historical snapshot does not include subsequent reports. Estimated capacity is separate from measured pump-test yield; missing fields are preserved. | October 23, 2026 |
| Texas | Published agency index | Dates vary by filing | Submitted driller reports from February 2001 to present. | October 30, 2026 |
| Utah | Historical snapshot | 2026-10-11 (logs); 2022-01-24 (use) | Actual public driller-log points imported October 2026 and joined to domestic-use classifications from January 2022. Permit-only points and missing WINs are excluded. Depth and water-level details remain in the linked state well logs. | October 23, 2026 |
| Vermont | Published agency index | Dates vary by filing | The state layer contains more than 110,000 well-completion reports filed since 1966, with location method and construction fields available by record. | October 23, 2026 |
| Virginia | Published agency index | Dates vary by filing | Statewide records combine multiple source agencies and can vary in completeness and location accuracy. | October 23, 2026 |
| Washington | Published agency index | Dates vary by filing | Ecology well reports include mapped location, depth, completion date, well type, static water level and flow where available; many locations are approximate to PLSS survey units. | October 23, 2026 |
| West Virginia | Non-household context | 2023-01-20 | These records provide agricultural, industrial, mining and other-use context. This source does not provide a household-well inventory. | October 23, 2026 |
| Wisconsin | Published agency index | Dates vary by filing | The public well inventory is updated nightly and includes private well-construction records plus depth, static-water, pumping and construction fields when available. | October 23, 2026 |
| Wyoming | Published agency index | Dates vary by filing | Published State Engineer inventory of complete or adjudicated domestic groundwater wells. Permit priority dates are not construction dates. The public inventory's refresh date is unspecified; verify current records in e-Permit. | October 23, 2026 |
Read the New Hampshire source guide and actual OneStop examples →
50 completed state integrations
Texas Water Development Board / Texas Department of Licensing and Regulation
Submitted driller reports from February 2001 to present.
Maine Geological Survey
Located wells include coordinates, depth, yield, static level, construction and well type; location accuracy varies.
Geological Survey of Alabama
Digital records are incomplete relative to the full hardcopy collection; additions are ongoing.
Michigan Department of Environment, Great Lakes, and Energy
More than 575,000 spatially verified records are published; pre-2000 coverage varies by county.
Minnesota Department of Health / Minnesota Geological Survey
The public index contains location, depth, geology, construction and static-water information for many Minnesota wells and borings; missing records do not prove no well exists.
Pennsylvania Geological Survey
Public PaGWIS points include well location, use, depth, reported yield and data-reliability fields; public-water supplies are excluded.
Ohio Department of Natural Resources
Mapped well records include depth, completion date, test rate, static water level and aquifer context; only records with known coordinates appear on the map layer.
New York State Department of Environmental Conservation
Registered driller completion reports have been collected since April 2000; mapped locations are generally parcel-scale and may not be the exact wellhead location.
Wisconsin Department of Natural Resources
The public well inventory is updated nightly and includes private well-construction records plus depth, static-water, pumping and construction fields when available.
Vermont Agency of Natural Resources
The state layer contains more than 110,000 well-completion reports filed since 1966, with location method and construction fields available by record.
Iowa Department of Natural Resources
The public facility layer includes private well permits, testing registrations, abandoned-well registrations and renovation records, with mapped locations and well depth where available.
Oklahoma Water Resources Board
The public groundwater-well layer includes well ID, permit, county, construction date, total depth, first water, approximate yield, aquifer and source links where available.
Colorado Division of Water Resources
The public DWR permit layer includes permit status, well depth, yield, static water level, aquifer/use context, construction dates and location accuracy where available.
Washington State Department of Ecology
Ecology well reports include mapped location, depth, completion date, well type, static water level and flow where available; many locations are approximate to PLSS survey units.
Kentucky Geological Survey / Kentucky Division of Water
KGS publishes mapped water-well records with depth, static water level, use and construction context; Kentucky did not require well registration before 1985, so older coverage can be incomplete.
Oregon Water Resources Department
Public well reports include depth, yield, static-water, use and drilling fields; many historical locations are mapped from survey descriptions rather than exact wellheads.
Virginia Department of Energy
Statewide records combine multiple source agencies and can vary in completeness and location accuracy.
Indiana Department of Natural Resources
The statewide inventory includes directly located and estimated well locations, so proximity alone does not establish parcel association.
Arizona Department of Water Resources
Registry records vary by filing type and completeness; nearby registry points should be verified against the original state record.
Mississippi Department of Environmental Quality / MARIS
The public layer is a November 2024 statewide snapshot with limited published attributes; it is not presented as a continuously updated registry.
Montana Bureau of Mines and Geology
GWIC records include multiple borehole and site types and vary in completeness and positional accuracy.
New Hampshire Department of Environmental Services / Geological Survey
Mapped NHGS inventory entries include WRB identifiers and OneStop record links, historical construction, tested yield and location-quality fields. Coverage and record precision vary; a nearby point does not confirm a property match.
Nevada Division of Water Resources
Public well-driller reports include construction and pump-test fields; mapped locations and historical values should be verified against the original report.
Kansas Geological Survey
Many well coordinates are derived from legal descriptions rather than surveyed wellheads, and structured field completeness varies by record.
Alaska Department of Natural Resources
WELTS data is provisional and location precision varies from GPS or parcel placement to broader survey-area centroids.
South Dakota Department of Agriculture and Natural Resources
Public well-log records include mapped location, depth, completion, driller, aquifer and static-water fields; location accuracy varies by record and should be verified against the source log.
California Department of Water Resources
DWR's statewide OSWCR index includes well-completion reports and construction/yield fields. DWR notes that missing, duplicate or incorrect values can occur and many mapped locations are PLSS section-center approximations; verify the original report.
Idaho Department of Water Resources
Statewide well records include permits, construction, depth, static water level, production rate and source documents where available. Older records and individual fields can be incomplete; verify mapped locations against the original report.
Nebraska Department of Water, Energy, and Environment
The registered-well inventory includes well status, use, depth, water levels, pumping and registration fields where available. Active and decommissioned wells must be distinguished, and mapped proximity does not establish parcel association.
Massachusetts Department of Environmental Protection
The April 2023 viewer dataset contains vetted, geolocated Well Completion Reports, including multiple well types. It is a subset of the full Well Driller Database; a mapped point may identify a parcel rather than an exact wellhead.
Missouri Department of Natural Resources / Missouri Spatial Data Information Service
Statewide certified well records published as a 2022 MSDIS snapshot. Older and pre-certification wells can be incomplete, and this snapshot is not presented as a live daily registry.
Delaware Department of Natural Resources and Environmental Control
Active or completed domestic well records with published locations. Proposed, voided and abandoned permits are excluded; location accuracy and historical completeness vary.
Illinois State Geological Survey / Prairie Research Institute
ILWATER records explicitly classified as private, semi-private or household/livestock water wells. Engineering borings and unclassified or other-use records are excluded; historical locations and missing fields vary.
Louisiana Department of Conservation and Energy / SONRIS
Active domestic water-well registrations. Oil/gas, monitoring, irrigation and abandoned wells are excluded. Older unregistered wells may be missing; reported yield is historical and is not a current supply guarantee.
Connecticut Department of Consumer Protection
Water-supply completion reports submitted online since January 1, 2021. Older paper records and geothermal/abandonment report types are excluded. Yield-test methods vary and locations require verification.
Wyoming State Engineer's Office / Department of Environmental Quality
Published State Engineer inventory of complete or adjudicated domestic groundwater wells. Permit priority dates are not construction dates. The public inventory's refresh date is unspecified; verify current records in e-Permit.
North Dakota Department of Water Resources
Statewide DWR domestic and domestic/stock records imported October 11, 2026. Explicit site/log links are reconciled. Many construction details remain in original scanned logs; historical coordinates can be approximate.
New Mexico Office of the State Engineer
September 1, 2026 OSE inventory of explicit domestic wells with recorded depth; surface diversions and plugged wells are excluded. Estimated yield is excluded from pumping-rate comparisons. The state database remains incomplete.
USGWD / HydroShare, compiled from public state agency records
Published domestic-well records collected in November 2022. Historical coverage is incomplete; current condition, operating status and property association require verification.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
Domestic records with reported completion years from a 2021-2022 compilation. Usable mapped coverage is concentrated in northern Florida. Application depths are labeled planned and excluded from recorded-depth statistics. Other regions have limited coverage.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
Published domestic-well locations collected in March 2023. This release has no well depths, construction years or test yields. It is a historical location inventory, with incomplete coverage and unverified current status.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
Published domestic-well inventory collected in August 2022. Missing details and possible source duplicates remain marked; historical coordinates and current operating status require verification.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
Published mapped domestic records collected in September 2022. This is a small, incomplete historical subset; many locations were matched approximately from addresses. Absence of a point does not mean absence of a well.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
Published domestic records for the Coastal Plain and Piedmont, collected in March 2023. Both inventories are incomplete. Historical depth and construction fields are available where reported; locations require verification.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
Published domestic-well records collected in January 2023. This historical snapshot does not include subsequent reports. Estimated capacity is separate from measured pump-test yield; missing fields are preserved.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
Agricultural wells only: irrigation, livestock and aquaculture records collected in September 2022. Household wells are not included. Agricultural depths provide regional context and are not a prediction for a residential well.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
The published inventory classifies these records as irrigation wells; household-well coverage is not provided. Collected in January 2023. Well types are preserved as published and require confirmation against original state records.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
Public-supply and agricultural wells collected in 2022-2023. Household-well coverage is not provided in this release. The inventory is incomplete; these well types and depths provide regional context, not residential supply predictions.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
USGWD / HydroShare, compiled from public state agency records
A small, sparse inventory of mapped agricultural, industrial, mining and other-use groundwater wells collected in January 2023. Household wells are absent; public-supply coordinates are not published. These records are regional context only.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.
Utah Division of Water Rights / Utah Geological Survey; USGWD use classification
Actual public driller-log points imported October 2026 and joined to domestic-use classifications from January 2022. Permit-only points and missing WINs are excluded. Depth and water-level details remain in the linked state well logs.
Lin, Miller, Waqar and Marston (2024), USGWD, HydroShare; CC BY 4.0. Filtered and normalized by WellLookup.