Water Hardness Levels

Hardness is a measure of the amount of certain naturally occurring minerals found in water, namely calcium and magnesium. While calcium and magnesium are essential minerals for human health, hardness may cause spotting on dishes and shower walls, affect the lathering of soap (more hardness = less lathering or suds = more soap/detergent required to do the same job) or cause deposits on water related fixtures. The following table shows the average hardness levels for representative sites throughout the district. The District has implemented measures to reduce hardness levels, which in the past have been significantly higher than those shown below. Depending on the exact blend of water coming from different sources at any given moment, your water hardness levels may vary from those shown on the chart. These values are for general reference only.

NOTE: The hardness values given in the table below are expressed in mg/l CaCO₃ (milligrams per liter as calcium carbonate) - many water softeners use grains/gallons values for determining settings - please refer to your manual to see how settings are calculated - to convert mg/l CaCO₃ to grains/gallons hardness, simply divide the values shown on the chart by 17.1

Hilton Head PSD Water Hardness Guide

The following table provides a general guideline for determining the hardness of water. This table can be consulted when choosing your water softener settings. Always consult your water softener manufacturer’s recommended settings:

1 to 3.5 grains per gallon (gpg); or 17 to 60 parts per million (ppm) = Slightly Hard

3.5 to 7 gpg; or 60 to 120 ppm = Moderately Hard

7 to 10 gpg; or 120 to 180 ppm = Hard

More than 10.5 gpg or 180 ppm = Very Hard

Location	Average Hardness: Mg/L (ppm) CaCO₃ _{Date: May 2012}	Average Hardness: Mg/L (ppm) CaCO₃ _{Date: October 2012}
Bayley Point Ln. at Ladson Ct.	54	84
Beach City Rd. (near Dillon / Fish Haul)	58	72
End of Brams Point Rd.	122	132
Cardinal Rd. at Hunter Rd.	42	60
Cherry Hill Ln. at Tucker Ridge Ct.	56	112
Coggins Point Rd. (Sherman / Doubloon)	104	52
Colonial Dr.	58	128
Crooked Pond Dr. at Anglers Pond Ln.	16	24
Dolphin Head Dr. at Dolphin Head Ln.	34	48
Dolphin Head Dr. at Whitetail Deer Ln.	40	30
End of Ft. Howell Dr.	48	44
Ft. Howell Dr. at Lennox Ave.	20	48
Ft. Walker Dr. at Oak Creek Dr.	92	92
Flying King Ct. at Seabrook Dr.	78	86
Ghost Crab Way at Folly Field Rd.	16	28
Harbour Passage at Millwright Dr.	166	180
Headlands Dr. at Misty Morning Dr.	30	24
Hickory Forest Dr. at Hickory Nut	42	24
High Bluff Rd. at Wing Shell Ln.	22	22
Hospital	24	24
Hwy 278 at Singleton Beach	16	24
Main Street at Main Street Bowling Lanes	78	24
Mariners Cove	164	176
Marshland Rd. at Leg-O-Mutton Rd.	18	44
Marshland Rd. at River Club Dr.	128	132
Old Fort Dr. at Old Fort Ln.	70	92
Oyster Reef Dr. at Whooping Crane Way	32	24
Spanish Wells Rd. at Owens Rd	150	112
Spanish Wells Rd. at Tansyleaf Dr.	108	100
Wedgefield Dr. at Sheldon Ln.	140	150
Widewater Rd. at McIntosh Rd.	106	100
Wildhorse Rd. at Gumtree Rd.	16	104
Beaufort-Jasper Supply Water	36	32

Contact Us
Customer Service	(843) 681 5525
Automated Information Line	(843) 681 0555
Fax	(843) 681 5052
Email	info@hhpsd.com

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