Williams County, ND
The federal environmental record for Williams County (population 39,113): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
3
federal cleanup sites
1
PFAS-detecting water systems
9
TRI facilities
4
open tank releases
Drinking water: PFAS testing
Public water systems serving Williams with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| NORTHWEST RURAL WATER DISTRICT, ND ND5301079 | PFBA: 6.3 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
9 facilities in Williams filed TRI reports for 2024, totalling 48k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| STATELINE COMPLEX | WILLISTON | n-Hexane, Cyclohexane | 19k lb |
| HESS TIOGA GAS PLANT LLC | TIOGA | n-Hexane, Methanol | 13k lb |
| NESSON GAS PLANT | TIOGA | n-Hexane, Benzene | 6k lb |
| WHITING OIL & GAS CORP LLC - RAY GAS PLANT | RAY | n-Hexane, Methanol | 3k lb |
| CHAMPIONX-WILLISTON | WILLISTON | Methanol, Ammonia | 3k lb |
| HALLIBURTON WILLISTON FIELD CAMP (HALWEST) | WILLISTON | Methanol, Lead And Lead Compounds | 2k lb |
| CRESTWOOD CRUDE LOGISTICS LP | EPPING | n-Hexane, Benzene | 862 lb |
| SABIN METAL WEST CORP | WILLISTON | Mercury And Mercury Compounds, Lead compounds | 209 lb |
| HALLIBURTON WILLISTON BAROID | WILLISTON | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 147 tank facilities in Williams: 107 tanks in service and 356 closed. 51 fuel releases are on record, of which 4 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Williams as Zone 1, the highest predicted indoor radon levels (over 4 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for Williams, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- BLACKTAIL CREEK SPILLMARMON
- FORMER ENVIRO SHIELD PRODUCTS, INCWILLISTON
- OLD WILLISTON LANDFILLWILLISTON