CaliforniaWell Data

Name: California Well Data
Creator: DrillerDB

Every dot on this map is a real well. We pulled all 1,051,746 California well-construction records - depth, water level, yield, and county - and drew the state with them. Brighter means more wells; color is how deep they go.

Look up your address Open the interactive well map

California drawn from 1,051,746 water wells; brightness shows well density and color shows typical well depth — Shallow Mid DeepBrightness = well density

165 ft

Median well depth

53 ft

Median water level

26 gpm

Median yield

Counties covered

Check the water table at your California address

See typical well depth and static water level near any California address, drawn from these same records - free.

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What 1,051,746 California wells tell us

1,051,746

California well records on file

165 ft

Median well depth (half between 64 and 308 ft)

53 ft

Median static water level (water table)

26 gpm

Median tested well yield

71%

Have a recorded depth (748,656 wells)

3,173

Distinct drilling companies on record

The median California well is 165 ft deep; the average is a bit higher (about 143 ft), pulled up by a long tail of very deep wells in the Driftless Area and the Door Peninsula. Numbers here come straight from filed well-construction reports - not a model.

How deep California wells go

Each bar is the share of wells finished at that depth (20-ft bins). Most California wells land between 40 and 200 ft.

0 ft200 ft400 ft600 ft+

Well depth & water by California county

All 58 California counties, ranked by number of wells on record. Median depth, median static water level, and median tested yield for each - real figures, computed from every filed report we hold.

County	Wells	Median depth	Water level	Yield
Santa Clara	80,857	39 ft	24 ft	26 gpm
Los Angeles	69,476	86 ft	53 ft	19 gpm
Fresno	52,411	204 ft	73 ft	51 gpm
Sonoma	49,613	158 ft	37 ft	27 gpm
Riverside	37,400	264 ft	78 ft	22 gpm
Alameda	36,716	30 ft	15 ft	22 gpm
San Diego	36,543	204 ft	47 ft	25 gpm
Sacramento	35,354	120 ft	48 ft	64 gpm
Tulare	33,527	243 ft	70 ft	101 gpm
San Bernardino	31,788	227 ft	102 ft	25 gpm
San Joaquin	30,007	201 ft	57 ft	121 gpm
Orange	27,322	48 ft	24 ft	40 gpm
Nevada	26,988	222 ft	61 ft	13 gpm
Kern	25,482	368 ft	107 ft	31 gpm
Contra Costa	25,298	42 ft	18 ft	19 gpm
San Luis Obispo	24,678	245 ft	97 ft	51 gpm
Placer	23,683	205 ft	37 ft	12 gpm
El Dorado	20,696	250 ft	44 ft	14 gpm
Madera	20,670	377 ft	177 ft	28 gpm
Butte	20,446	159 ft	54 ft	21 gpm
Stanislaus	18,770	186 ft	52 ft	75 gpm
Mendocino	18,564	128 ft	33 ft	12 gpm
Merced	18,241	203 ft	40 ft	102 gpm
San Mateo	16,331	40 ft	14 ft	14 gpm
Tehama	15,832	165 ft	84 ft	55 gpm
Yolo	15,745	201 ft	36 ft	77 gpm
Shasta	15,683	149 ft	51 ft	29 gpm
Santa Barbara	15,465	229 ft	82 ft	54 gpm
Solano	14,458	111 ft	16 ft	50 gpm
Monterey	14,091	259 ft	91 ft	26 gpm
Ventura	13,412	210 ft	45 ft	33 gpm
Napa	12,148	295 ft	47 ft	35 gpm
Yuba	10,693	169 ft	41 ft	16 gpm
Siskiyou	10,650	137 ft	44 ft	23 gpm
Plumas	10,197	149 ft	31 ft	18 gpm
Santa Cruz	9,706	201 ft	75 ft	19 gpm
Kings	9,185	270 ft	93 ft	101 gpm
Sutter	8,979	109 ft	17 ft	76 gpm
Calaveras	8,274	304 ft	80 ft	21 gpm
Amador	7,959	266 ft	68 ft	17 gpm
Mariposa	7,433	224 ft	45 ft	15 gpm
Tuolumne	7,338	323 ft	56 ft	19 gpm
Lake	7,083	118 ft	47 ft	29 gpm
Glenn	7,056	157 ft	78 ft	53 gpm
Marin	7,049	49 ft	21 ft	10 gpm
San Francisco	6,902	28 ft	12 ft	10 gpm
Humboldt	6,685	65 ft	45 ft	13 gpm
Lassen	5,730	154 ft	34 ft	24 gpm
Colusa	4,082	226 ft	44 ft	55 gpm
Trinity	3,275	164 ft	63 ft	12 gpm
Modoc	2,931	226 ft	47 ft	50 gpm
San Benito	2,889	228 ft	54 ft	42 gpm
Inyo	2,661	141 ft	30 ft	55 gpm
Del Norte	2,387	44 ft	19 ft	19 gpm
Mono	1,789	202 ft	64 ft	51 gpm
Imperial	1,405	64 ft	26 ft	77 gpm
Sierra	967	164 ft	40 ft	22 gpm
Alpine	640	146 ft	33 ft	28 gpm

Find well drillers in California What it costs to drill a well in California

Explore every well

The static map above is the whole state at a glance. Open the interactive DrillerDB well map to zoom to any California address, click individual wells, and read their depth, water level, and construction details.

Open the well map

DrillerDB interactive water-well depth map

A century of California wells

California has required a well construction report for every new well since 1936, and DrillerDB's records reach back to the 1930s. Wells drilled per decade:

1930s

1940s

1950s

1960s

1970s

1980s

1990s

2000s

2010s

2020s

California well questions

How deep are wells in California?

The median water well in California is 165 ft deep, based on 748,656 records with a reported depth. Half of all wells fall between 64 and 308 ft. Depth varies a lot by county - from about 28 ft in the shallowest counties to over 377 ft in the deepest.

What is the water table depth in California?

The median static water level (the depth to standing groundwater) across California records is about 53 ft. It is usually much shallower than the finished well depth, because wells are drilled past the water table to reach a dependable aquifer.

How many well records does California have?

DrillerDB holds 1,051,746 California well records - part of an 18-million-record national database built from state well-construction reports. California has required a well construction report for every new well since 1936.

How do I look up a specific address or well in California?

Use the free water table depth lookup to see typical depth and water level at any address, or open the interactive well map to browse individual well records near a location.

Source: 1,051,746 California well-construction records in the DrillerDB database, current through June 2026. Medians are computed from reported values; individual wells vary. Always confirm site conditions with a licensed local driller.

Well data for other states

The same real-record breakdown - median well depth, static water level, yield, and county tables - for the other states in the DrillerDB database.

Michigan well data Ohio well data Texas well data Washington well data Wisconsin well data

Researcher? Academic and institutional researchers can get free record-level access to these wells for non-commercial work through the DrillerDB Research Program.

About the Research Program

Planning a well?

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Drill wells for a living?

This is the same well data that powers quoting, scheduling, and state reporting for drilling companies across the country.

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