Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_14021 ( "Township" text, "County" text, "Pop. (2010)" real, "Land ( sqmi )" real, "Water (sqmi)" real, "Latitude" real, "Longitude" real, "GEO ID" real, "ANSI code" real )

### Question ###
Which Water (sqmi) has a County of benson, and an ANSI code smaller than 1759243?

### Accurate SQL ###

SELECT MIN("Water (sqmi)") FROM table_14021 WHERE "County" = 'benson' AND "ANSI code" < '1759243'