Islands of Truk, Federated States of Micronesia

Survey Area FM933• Federated States of Micronesia

The dominant drainage class is Well drained and the dominant hydrologic group is A (high infiltration, low runoff). The most common soil order is Inceptisols — young soils with minimal horizon development but more than Entisols. This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Islands of Truk, Federated States of Micronesia. Search your address to find the exact soil composition, drainage, and series details at your specific location.

Soil Map Unit	Acres	Drainage	Hydro Group	Dwellings	Septic
Tolonier very stony silty clay loam, 30 to 50 percent slopes	5K	Well drained	A	Very limited	Very limited
Chia mucky peat, 0 to 2 percent slopes, frequently flooded	2K	Very poorly drained	A/D	Very limited	Very limited
Tolonier very stony silty clay loam, 50 to 75 percent slopes	2K	Well drained	A	Very limited	Very limited
Tolonier very stony silty clay loam, 12 to 30 percent slopes	2K	Well drained	A	Very limited	Very limited
Dolen silty clay loam, 12 to 30 percent slopes	2K	Well drained	A	Very limited	Very limited
Rock outcrop-Rubble land complex, 0 to 99 percent slopes	1K			Not rated	Not rated
Ngerungor mucky peat, 0 to 1 percent slopes, MLRA 195	1K	Very poorly drained	A/D	Very limited	Very limited
Dolen silty clay loam, 6 to 12 percent slopes	1K	Well drained	A	Somewhat limited	Very limited
Typic Udorthents-Urban land complex, 0 to 1 percent slopes	857	Well drained	A	Not limited	Very limited
Dolen silty clay loam, 30 to 50 percent slopes	850	Well drained	A	Very limited	Very limited
Tolonier very stony silty clay loam, 6 to 12 percent slopes	758	Well drained	A	Very limited	Very limited
Dublon loamy fine sand, 0 to 2 percent slopes, occasionally flooded	677	Somewhat poorly drained	A	Very limited	Very limited
Ollei taxadjunct-Wahrekdam complex, 2 to 8 percent slopes	440	Well drained	D	Very limited	Very limited
Insak taxadjunct sandy peat, 0 to 2 percent slopes, frequently flooded	380	Very poorly drained	B/D	Very limited	Very limited
Dolen silty clay loam, 50 to 75 percent slopes	148	Well drained	A	Very limited	Very limited
Typic Tropohemists, 0 to 2 percent slopes, MLRA 195	30	Very poorly drained	A/D	Very limited	Very limited
Water	11		D	Not rated	Not rated

Soil Orders in This Area

The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.

Inceptisols

Young but developing soils found in mountains and river terraces. Variable properties — check drainage and bedrock depth.

Alfisols

Moderately weathered forest soils with clay-enriched subsoil. Productive for agriculture, generally good for building and septic.

Histosols

Organic peat and muck soils formed in wetlands. Very poor for building (compressible) and septic. Often in regulated wetlands.

Entisols

Young soils with little development — found on floodplains, dunes, and steep slopes. Properties vary widely by setting.

Oxisols

Deeply weathered tropical soils. Nutrient-poor despite appearing lush. Rare in the continental US.

What This Means

Building & Foundations

About 85% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 94% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.

Gardening & Agriculture

Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.