Section 70. Ground water criteria

CONSTITUENT (mg/l)	GROUND WATER CRITERIA BY PHYSIOGRAPHIC PROVINCE***
	Coastal Plain	Piedmont & Blue Ridge	Valley & Ridge	Cumberland Plateau
Alkalinity	30-500	10-200	30-500	30‑200
Total Diss. Solids	1000	250	500	500
Chloride	50*	25	25	25
Sulfate	50	25	100	150
Total Organic Carbon	10	10	10	10
Color units	15	15	15	15
Iron	0.3	0.3	0.3	0.01-10
Manganese	0.05	0.05	0.05	0.01-0.5
Sodium	100*	25	25	100
Fluoride	1.4**	1.4	1.4	1.4
Hardness	120	120	300	180

*It is recognized that naturally occurring concentrations will exceed this limit in the eastern part of the Coastal Plain, especially toward the shoreline and with increased depth.

**Except within the cretaceous aquifer: concentration up to 5 mg/l and higher.

***See Figure 1 for delineation of physiographic provinces.

Figure 1

Historical Notes

Derived from Volume 20, Issue 09, eff. February 12, 2004.

Statutory Authority

§ 62.1-44.15 of the Code of Virginia.