Results — MPAT

NoteAt a glance
  • Output date: 2026-04-28
  • Coverage: 27,224 cesspool-bearing parcels and 34,142 cesspools
  • Pilot islands: Maui, Oahu, Kauai
  • CRS: EPSG:32604

This output covers the pilot islands only. See Start Here for the remaining-island scope.

Coverage by island

Measure Kauai Maui Oahu Total
Cesspool-bearing parcels 9,994 7,505 9,725 27,224
Cesspools (osds_qty) 13,779 10,337 10,026 34,142

Summary statistics

Column Min Median Max NA
depth_to_wt_ft 1.00 155.14 9,876.83 49
net_parcel_area_sqft -1,757,446 10,371 717,010,242 0
slope_pct 0.00 5.12 160.81 87
dist_to_coast_ft 0.55 6,672 54,835 0
dist_to_dom_well_ft 5.11 7,662 63,972 0
dist_to_mun_well_ft 15.06 5,786 70,074 0
ksat_r 0.22 13.33 398.50 54
avg_rainfall_in 10.79 47.47 214.37 5

Summary graphs

Horizontal bar chart showing cesspool counts by island.

Cesspool count by island.

Histogram showing the distribution of depth to water table in feet on a log-scale x-axis.

Distribution of depth_to_wt_ft.

Boxplot showing ksat_r distributions for Maui, Oahu, and Kauai.

Distribution of ksat_r by island.

Four-panel histogram showing distance distributions to coast, streams, domestic wells, and municipal wells.

Distance distributions: coast, streams, domestic wells, municipal wells.

Parcel analysis points

The companion parcel analysis points GeoPackage contains 27,224 point features in EPSG:32604. Columns are tmk, analysis_point_source, and geometry. The file is keyed on the same tmk field as the MPAT.

Island building_fp_largest_centroid parcel_centroid Total
Kauai 9,855 139 9,994
Maui 7,202 303 7,505
Oahu 8,411 1,314 9,725
Total 25,468 1,756 27,224

Horizontal grouped bar chart showing analysis point source counts by island.

Analysis point source by island.

Constraint flags

Field Value Count Percent
sfha_tf T 3,280 12.05%
sfha_tf F 23,944 87.95%
analysis_point_source building_fp_largest_centroid 25,468 93.55%
analysis_point_source parcel_centroid 1,756 6.45%

Data quality notes

  • slope_pct has 87 NA values.
  • ksat_r has 54 NA values.
  • depth_to_wt_ft has 49 NA values.
  • avg_rainfall_in has 5 NA values.
  • net_parcel_area_sqft includes negative values where building-footprint area exceeded parcel area. See Screen Techs for the screening handling note.