OAR 690-210-0270
Pitless Well Adapters and Units

Surface seal requirements for well casing set forth herein shall also apply when a pitless adapter or unit is installed in a well. The seal shall cover that interval occupied by the pitless case from the point of casing connection to land surface. A cement grout seal shall not be allowed within the pitless unit or pitless adaptor sealing interval. The pitless adapter or unit sealing interval shall be sealed with unhydrated bentonite as described in OAR 690-210-0330 (Unhydrated Bentonite) and 690-210-0340 (Method of Placement of Unhydrated Bentonite). The pitless adapter or unit, including the cap or cover, pitless case and other attachments, shall be designed and constructed to be watertight to prevent the entrance of contaminants into the well from surface or near-surface sources. Pitless units shall be vented to the atmosphere. Refer to OAR 690-210-0210 (Plastic Casing) if the pitless adaptor or unit is to be used in conjunction with PVC casing.
NOTE: Prior to installing pitless well adapters or units on public, community, municipal, or public utility water supply wells, contact the Department of Human Resources. (See references to Health Division regulation in Appendix 210-1).
[ED. NOTE: The Appendices referenced are available from the agency.]
[ED. NOTE: To view attachments referenced in rule text, click here to view rule.]

Source: Rule 690-210-0270 — Pitless Well Adapters and Units, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=690-210-0270 (accessed May 26, 2025).

690–210–0005
Standards Apply to all Methods of Well Construction 690–210–0030
Placement of Water Supply Wells 690–210–0060
Explosives 690–210–0065
Hydrofracturing 690–210–0070
Injection Wells 690–210–0100
Mineralized or Contaminated Groundwater 690–210–0130
Sealing of Wells in Unconsolidated Formations Without Significant Clay Beds 690–210–0140
Sealing of Water Supply Wells in Unconsolidated Formations with Significant Clay Beds 690–210–0150
Sealing of Water Supply Wells in Consolidated Formations 690–210–0155
Additional Standards for Artesian Water Supply Wells 690–210–0160
Additional Standards for Filter Pack Wells with Surface Casing 690–210–0170
Additional Standards for Filter Pack Wells without Surface Casing 690–210–0180
Additional Standards for Driven or Jetted Wells 690–210–0190
Steel Casing 690–210–0200
Steel Casing Joints 690–210–0210
Plastic Casing 690–210–0220
Plastic Casing Joints 690–210–0230
Inner Casing 690–210–0240
Casing Shall be Centered 690–210–0250
Top Terminal Height 690–210–0260
Openings in the Casing 690–210–0270
Pitless Well Adapters and Units 690–210–0280
Access Ports, Dedicated Measuring Tubes and Airlines 690–210–0290
Liner Pipe 690–210–0300
Drill Cuttings or Chips 690–210–0310
Cement Grout 690–210–0315
Concrete 690–210–0320
Methods of Placement of Cement Grout or Concrete 690–210–0330
Unhydrated Bentonite 690–210–0340
Method of Placement of Unhydrated Bentonite 690–210–0350
Resumption of Construction Following Placement of Cement Grout 690–210–0360
Movement of Casing after Cement Grouting 690–210–0370
Well Test 690–210–0380
Disinfection of a Well 690–210–0390
Completion of Wells 690–210–0400
Construction of Dug Wells 690–210–0410
Buried Slab Construction 690–210–0420
Surface Curbing

May 26, 2025

Rule 690-210-0270's source at or​.us