Cornload Estimates are computer-generated, not appraisals
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All field notes

Wells & water

Buying a home with a well: ask about quality and supply.

Before buying a home on a private well, get the well records, have a qualified lab test the water, and have a well professional check the pump and supply. A clean water test does not prove the well can supply the house, so review quality and supply separately.

Cornload field notes · Checked

Start with records

  • Request well construction records, available permits and the location of the well.
  • Collect water-quality reports, pump service records and treatment-system details.
  • For a shared well, request the recorded agreement and ask who handles costs, access and repairs.
  • Ask a well professional what supply and equipment evaluation suits your intended household and land use.

Choose testing for the property

The California Water Boards recommend annual domestic-well water-quality testing. Ask the local environmental health department and a qualified laboratory which contaminants to test for, how to collect samples and how to interpret results. Do not assume a seller's old test answers every current question.

In California, local jurisdictions oversee well construction, alteration and destruction. Use DWR's permitting-agency directory to find the right office before planning well work.

Bring it back to your budget

Ask for written findings and estimates for any recommended work. Your decision should account for the cost of evaluation, treatment, equipment maintenance and any confirmed repair needs.

Country homes on Cornload with a private well

1,040 parcels on Cornload. From each home's MLS listing at its last sale. Showing 48, largest first.

Contra Costa County all Contra Costa parcels

  1. 3501 Byer RoadByron · 44 ac · $2.96M estimate
  2. 8191 Highland RdLivermore · 43.65 ac · $2.21M estimate
  3. 5995 Briones Valley RdBrentwood · 40.4 ac · $1.59M estimate
  4. 6445 Morgan Territory RdClayton · 40.05 ac · $2.87M estimate
  5. 4500 Kellogg Creek RdByron · 40 ac · $1.46M estimate
  6. 9615 Deer Valley RoadBrentwood · 40 ac · $2.12M estimate
  7. 6500 Highland RdSan Ramon · 40 ac · $2.71M estimate
  8. 25685 Marsh Creek RoadBrentwood · 37.5 ac · $1.52M estimate
  9. 100 Rancho De MariaMartinez · 35.62 ac · $2.36M estimate
  10. 3600 Byer RdByron · 28.37 ac · $4.91M estimate
  11. 4175 Briones Valley RdBrentwood · 22.97 ac · $1.15M estimate
  12. 9621 Deer Valley RoadBrentwood · 21.06 ac · $2.08M estimate
  13. 350 Camino Diablo RoadBrentwood · 20 ac · $1.52M estimate
  14. 110 Valley Hill DriveMoraga · 19.81 ac · $2.79M estimate
  15. 2660 Franklin Canyon RoadMartinez · 19.44 ac · $1.34M estimate
  16. 15001 Highway 4Byron · 18.1 ac · $2.46M estimate
  17. 16700 Marsh Creek RdClayton · 16.84 ac · $730K estimate
  18. 100 Los BalconesAlamo · 14.59 ac · $3.19M estimate
  19. 540 Camino DiabloBrentwood · 13.97 ac · $1.65M estimate
  20. 7225 Johnston RoadPleasanton · 12.39 ac · $2.38M estimate
  21. 4411 Camino Vaqueros -Brentwood · 12.09 ac · $1.3M estimate
  22. 1200 N Gate RdWalnut Creek · 11.87 ac · $3.35M estimate
  23. 1950 Tule LnKnightsen · 10.98 ac · $1.24M estimate
  24. 10961 Morgan Territory RdLivermore · 10.45 ac · $1.81M estimate
  25. 7151 Johnston RdPleasanton · 10.32 ac · $2.06M estimate
  26. 6840 Balfour RdBrentwood · 10.27 ac · $1.65M estimate
  27. 79 Pastor LnBrentwood · 10 ac · $1.45M estimate
  28. 4175 Camino DiabloByron · 10 ac · $2.29M estimate
  29. 3520 Orwood RdBrentwood · 10 ac · $1.24M estimate
  30. 4985 Bixler RoadByron · 10 ac · $2.8M estimate
  31. 6780 Balfour RdBrentwood · 10 ac · $3.41M estimate
  32. 24200 Marsh Creek RdBrentwood · 9.77 ac · $1.79M estimate
  33. 2405 Sunset RdKnightsen · 9.54 ac · $1.95M estimate
  34. 2151 Bartels DrBrentwood · 9.49 ac · $2.33M estimate
  35. 2200 Delta RdKnightsen · 9.33 ac · $1.69M estimate
  36. 621 Bear Oaks LnMartinez · 8.96 ac · $2.73M estimate
  37. 2650 Sellers AveBrentwood · 8.86 ac · $2.23M estimate
  38. 2251 Rancho Del Lago RdMartinez · 8.27 ac · $1.58M estimate
  39. 7210 Johnston RdPleasanton · 7.91 ac · $3.41M estimate
  40. 195 Chanticleer LnAlamo · 7.81 ac · $5.74M estimate
  41. 300 Rancho de Maria roadMartinez · 6.38 ac · $1.73M estimate
  42. 10580 Morgan Territory RoadLivermore · 6.31 ac · $1.59M estimate
  43. 2000 Curry Canyon RdClayton · 6.11 ac · $940K estimate
  44. 1000 Vintage DriveOakley · 5.65 ac · $1.35M estimate
  45. 1 Pinehurst RoadCanyon · 5.62 ac · $2.26M estimate
  46. 325 Bollinger Estates CtSan Ramon · 5.62 ac · $2.56M estimate
  47. 70 Sherburne HillsDanville · 5.6 ac · $2.54M estimate
  48. 60 OLD STAGECOACH ROADBrentwood · 5.36 ac · $1.22M estimate

Sources

Checked Oct 7, 2026. Rules, programs and costs change. Confirm with the agency or a qualified professional before making a property decision.

Put the questions to work.

A Cornload Certified Land Specialist can help you check these details on a specific property.

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