New York Codes, Rules and Regulations
Title 10 - DEPARTMENT OF HEALTH
Chapter - APPENDICES
Appendix 5-D
Table 2 - Yield Test and GWUDI Determination Requirements for Wells Serving Public Water Systems

Current through Register Vol. 46, No. 12, March 20, 2024 Well Geologic Type of Public Water System (See Subpart 5-12 Formation CWS, NTNCWS TNCWS And Casing Depth Duration GWUDI Duration (hrs) GWUDI (hrs)3 Testing Testing For Wells Located 200 feet or less from Surface Water All Geology and Casing 72 Yes Per 5-B.4 if allowed Yes Depths by LHD4 For Wells Located greater than 200 feet from Surface Water Sand and gravel; G50 24 Yes Per 5-B.4(b) if Yes feet casing allowed by LHD4 Sand and gravel; >50 24 No Per 5-B.4(b) if No feet casing allowed by LHD4 Non-Carbonate Rock; 72 Yes Per 5-B.4(b) if Yes G50 feet casing allowed by LHD4 Non-Carbonate Rock; 72 No Per 5-B.4(b) if No >50 feet casing allowed by LHD4 Carbonate Rock; All 72 Yes Per 5-B.4(b) if Yes Casing Depths5 allowed by LHD4

1 GWUDI means ground water source directly influenced by surface water source. Where well water sources may be potentially influenced by surface water, appropriate water quality testing shall be done in accordance with Department guidance to determine if the well water source is directly influenced by surface water.

2 CWS means community water system as defined in 10 NYCRR Subpart 5-1. NTNCWS means nontransient noncommunity water system as defined in 10 NYCRR Subpart 5-1. TNCWS means a public water system that is neither a CWS nor a NTNCWS.

3 Specified duration is the minimum required pumping period and must include a minimum of six hours of stabilized drawdown at the end of the test except as allowed under subdivision 5-D.4(d) of this Appendix.

4 LHD means local health department as defined in Appendix 5-B.

5 For wells located in areas that have the potential to draw water from carbonate aquifers, the local health department may determine based upon a hydrogeologic assessment, records of well logs, and/or other local geologic data that the aquifer is unlikely to show a surface water influence associated with karst topography. Where such determination is made, GWUDI testing need not be done.