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Northern Mariana Islands Environment & Hazard Risk

0 counties rated high or very high risk.

Expected yearly loss
$60.65M
$1,283 per person
Storm events since 1996
0
Superfund sites
1
4 toxic release facilities

Risk by county

FEMA National Risk Index rating, highest risk first

CountyOverall riskTop hazardFlood policiesFlood claims paid
Northern Islands MunicipalityNot rated---
Rota MunicipalityNot ratedCoastal flooding--
Saipan MunicipalityNot ratedCoastal flooding--
Tinian MunicipalityNot ratedCoastal flooding--

Costliest hazards

Expected annual loss in Northern Mariana Islands, all counties combined

  • Tsunami$33.07M/yr
  • Hurricane$23.87M/yr
  • Earthquake$3.64M/yr
  • Coastal flooding$52.8K/yr
  • Volcanic activity$2,235/yr

Drinking water

35 community water systems serve about 63,904 people

Since 2021, 12 systems reported 36 health-based violations. 6 systems had a violation of any kind still open at last report. These had the most:

  • Commonwealth Utilities Corp (Saipan)Serves 48,524 · Groundwater · State6 health violations
  • Pacific PalmsServes 56 · Groundwater · Private6 health violations+63 monitoring or reporting
  • Aqua WaterServes 170 · Groundwater · Private4 health violations+1 monitoring or reporting
  • Afetna SupermarketServes 40 · Purchased groundwater · Private4 health violations+1 monitoring or reporting
  • Crystal Ice And WaterServes 30 · Purchased groundwater · Private4 health violations+8 monitoring or reporting
  • Modern StationaryServes 60 · Groundwater · Private3 health violations+2 monitoring or reporting
  • Diamond Water Gualo RaiServes 55 · Groundwater · Private3 health violations+1 monitoring or reporting
  • Saipan VegasServes 100 · Groundwater · Private2 health violations+9 monitoring or reporting

Select a county above to see every system that serves it.

Pollution sites

1 Superfund site and 4 toxic release facilities

Superfund sites

All 1 in Northern Mariana Islands

Largest toxic releases

All 4 in Northern Mariana Islands

Facilities in Northern Mariana Islands reported 4,555 lbs of toxic releases in 2024, 4,554 lbs of it into the air.

Frequently asked questions

What is the biggest natural hazard in Northern Mariana Islands?
By expected annual loss, tsunami costs the most in Northern Mariana Islands ($33.07M a year), according to FEMA's National Risk Index.
How many Superfund sites are in Northern Mariana Islands?
Northern Mariana Islands has 1 Superfund site on or deleted from EPA's National Priorities List.

Source: FEMA, NOAA, EPA · Last updated 08/01/2026 · Storm counts include events in forecast zones that touch each county. This product uses the FEMA OpenFEMA API, but is not endorsed by FEMA.