74:02:04:43Thermoplastic casing
Section · Administrative Rules of South Dakota · View on sdlegislature.gov ↗
requirements. All thermoplastic casing used for water well casing must meet or exceed ASTM Standard F 480-90e and NSF Standard 14 (1990). Thermoplastic well casing five inches in diameter or larger must have a minimum wall thickness of 0.250 inches.
Source: 12 SDR 50, effective September 29, 1985; 13 SDR 129, 13 SDR 141, effective July 1, 1987; 18 SDR 224, effective July 16, 1992.