Langelier Index Summary for Public Water Supplies in Newfoundland and Labrador

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1 Anchor Point Anchor Point Well Cove Brook Dec 14, Appleton Appleton (+Glenwood) Gander Lake (The Outflow) Nov 14, Aquaforte Aquaforte Davies Pond Dec 01, Arnold's Cove Arnold's Cove Steve's Pond (2 Intakes) Nov 04, Avondale Avondale Lee's Pond Dec 05, Bay L'Argent Bay L'Argent Sugarloaf Hill Pond Dec 07, Bay Roberts Bay Roberts, Spaniard's Bay Rocky Pond Nov 21, Bay de Verde Bay de Verde Island Pond Dec 12, Beaches Beaches Grassey Pond Brook Nov 23, Bellevue Bellevue Big Pond Nov 10, Bellevue Beach Bellevue Beach Unnamed Brook Nov 10, Benton Benton Little Pond Nov 16, Biscay Bay Biscay Bay Unnamed Pond Dec 01, Bonavista Bonavista Long Pond Nov 16, Branch Branch Valley Pond Dec 14, Brigus Brigus (+Cupids, +South Brigus Long Pond (to Nov 22, River) Brigus) Bryant's Cove Bryant's Cove (Backup Kelly's Pond (Spider's Nov 22, Supply) Pond) Burgeo Burgeo Long Pond Dec 06, Burgoyne's Cove Burgoyne's Cove Lower Rocky Pond Nov 15, Burin Burin Long Pond Dec 08, Burin Burin (+Lewin's Cove) Big Pond Dec 08, Burnt Islands Burnt Islands Long Lake Nov 01, Burnt Islands Burnt Islands - PWDU Long Lake Nov 01, Cape Freels North Cape Freels North Long Pond Nov 15, Cape St. George Cape St. George, Red Rouzes Brook Nov 22, Brook, De-Grau, Marches Point Carbonear Carbonear Island Pond / Flings Long Nov 21, Pond Carmanville Carmanville Grandfathers Pond Nov 15, Cartwright Cartwright Burdett's Pond Oct 04, Cartwright Cartwright - PWDU Burdett's Pond Oct 04, Cavendish Cavendish Long Pond Nov 30, Centreville-Wareham-Trinity Centreville-Wareham Northwest Pond Nov 16, Centreville-Wareham-Trinity Trinity Southwest Feeder Pond Nov 16, Channel-Port aux Basques Channel-Port Aux Basques Gull Pond & Wilcox Pond Nov 01, Charlottetown (Labrador) Charlottetown (Labrador) Middle Pond Oct 06, Charlottetown (Labrador) Charlottetown (Labrador) - Middle Pond Oct 06, PWDU Clarenville Clarenville, Shoal Harbour Shoal Harbour River Nov 14, May 10, 2017 Page 1 of 7

2 Clarke's Beach Clarkes Beach Clarkes Pond Nov 21, Come By Chance Come By Chance Butchers Brook Nov 04, Conception Bay South Conception Bay South Bay Bulls Big Pond Dec 12, Conche Conche Martin's Brook Nov 30, Corner Brook Corner Brook (+Massey Trout Pond, Third Pond (2 Dec 09, Drive, +Mount Moriah) intakes) Cow Head Cow Head Short Cat Path Pond Dec 07, Cow Head Cow Head - PWDU Short Cat Path Pond Dec 07, Cox's Cove Cox's Cove Cox's Brook Dec 12, Cupids Cupids Brigus Long Pond (to Nov 22, Brigus) Daniel's Harbour Daniel's Harbour Unnamed Spring & Brook Dec 07, Deadman's Bay Deadman's Bay Deadman's Pond Nov 15, Deer Lake Deer Lake (+Reidville) Humber Canal, Grand Lake Nov 02, Dildo Dildo, Broad Cove (+South Broad Cove Pond Nov 30, Dildo) Dover Dover Hare Bay Pond Nov 16, Elliston Elliston Big Pond Nov 16, Englee Englee Island Cove Pond Nov 29, Fermeuse Fermeuse, Kingman's Merrymeeting Pond, Bear Dec 01, Cove Pond (2 intakes) Ferryland Ferryland Deep Cove Pond Dec 01, Flower's Cove Flower's Cove (+Nameless French Island Pond Dec 14, Cove) Forteau Forteau Trout Brook Oct 05, Fortune Fortune (+Grand Bank) Horsebrook Dec 06, Gallants Gallants Gallant's Brook Dec 07, Gambo Gambo Dark Cove Pond Nov 16, Gander Gander Gander Lake Nov 14, Gander Bay South George's Point, Harris Point Barry's Brook Nov 15, Garden Cove Garden Cove Arch Cove Pond Dec 05, Garnish Garnish Witchazel Pond Dec 08, Gaskiers Gaskiers-Point La Haye Big Hare Hill Pond Dec 01, George's Brook-Milton George's Brook George's Brook Nov 15, George's Brook-Milton Milton Lilly Pond Nov 15, Gillams Gillams Meaters Pond Dec 12, Glenburnie-Birchy Glenburnie-Birchy Croucher's Brook Nov 02, Head-Shoal Brook Head-Shoal Brook Glenwood Glenwood Gander Lake (The Outflow) Nov 14, Glovertown Glovertown Northwest Pond Nov 23, Goobies Goobies Water Pond Dec 05, Grand Bank Grand Bank Horsebrook Dec 06, Grand Le Pierre Grand Le Pierre Nip Nose Pond Dec 05, May 10, 2017 Page 2 of 7

3 Greenspond Greenspond Shambler's Cove Pond Nov 16, Hampden Hampden Elliot Brook Nov 23, Hant's Harbour Hant's Harbour Eastern Pond (Halfway Dec 12, Brook) Happy Adventure Happy Adventure Goose Neck Pond Nov 23, Happy Valley-Goose Bay Happy Valley-Goose Bay Well Field (connect summer Oct 07, ) Happy Valley-Goose Bay Happy Valley-Goose Bay Spring Gulch Oct 07, Harbour Grace Harbour Grace, Harbour Bannerman Lake Nov 21, Grace South (+Riverhead) Harbour Main-Chapel's Harbour Main, Chapel's Maloney's River Dec 05, Cove-Lakeview Cove, Lakeview Harbour Mille-Little Harbour Harbour Mille, Little Harbour Head Pond Dec 07, East East (Fortune Bay) Hare Bay Hare Bay (+Dover) Hare Bay Pond Nov 16, Hawke's Bay Hawke's Bay Torrent River Dec 14, Heart's Content Heart's Content Southern Cove Pond Nov 30, Heart's Delight-Islington Heart's Delight-Islington Long Pond Nov 30, Heart's Desire Heart's Desire Terrence Pond Nov 30, Hickman's Hickman's Big Loss Pound Pond Nov 15, Harbour-Robinson Bight Harbour-Robinson Bight Hopedale Hopedale American Pond Nov 16, Howley Howley Sandy Lake Nov 02, Howley Howley - PWDU Sandy Lake Nov 02, Hughes Brook Hughes Brook Reservoir Dec 13, Humber Arm South Frenchman's Cove Area Gurges Pond Dec 09, Humber Arm South Halfway Point, Benoit's Dormody's Brook Dec 09, Cove, John's Beach Indian Bay Indian Bay Indian Bay Brook Nov 16, Irishtown-Summerside Irishtown Irishtown Brook Dec 13, Irishtown-Summerside Summerside Pynn's Pond Dec 12, Isle aux Morts Isle aux Morts Burnt Ground Pond Nov 01, Isle aux Morts Isle aux Morts - PWDU Burnt Ground Pond Nov 01, Jackson's Arm Jackson's Arm - PWDU Unnamed Brook Nov 23, Keels Keels Boland's Pond Nov 15, L'Anse au Clair L'Anse au Clair Park Pond Oct 06, L'Anse au Loup L'Anse au Loup L'anse Au Loup River Oct 05, Labrador City Labrador City Beverly Lake Oct 13, Lamaline Lamaline Upper Hodges Pond Dec 06, Lamaline Lamaline - PWDU Upper Hodges Pond Dec 06, Lawn Lawn Brazil Pond Dec 06, Lawn Lawn - PWDU Brazil Pond Dec 06, Little Harbour East Little Harbour East (Placentia Bay) Unnamed Pond Nov 04, May 10, 2017 Page 3 of 7

4 Little St. Lawrence Little St. Lawrence Butler's Brook (2 Intakes) Dec 06, Long Harbour-Mount Long Harbour-Mount Shingle Pond and/or Trout Nov 04, Arlington Heights Arlington Heights Pond (2 Intakes) Lourdes Lourdes (+West Bay) Victor's Brook Nov 22, Lower Lance Cove Lower Lance Cove Big Long Pond Nov 15, Lumsden Lumsden Gull Pond Nov 15, Main Brook Main Brook Joe Burt's Pond Nov 30, Mainland Mainland Caribou Brook Nov 22, Makkovik Makkovik Ranger Bight Pond Nov 16, Makkovik Makkovik - PWDU Ranger Bight Pond Nov 16, Mary's Harbour Mary's Harbour St. Mary's River Oct 05, Mary's Harbour Mary's Harbour - PWDU St. Mary's River Oct 05, Marystown Marystown Fox Hill Reservoir / Clam Dec 08, Pond Massey Drive Massey Drive Trout Pond, Third Pond (2 Dec 19, intakes) McIvers McIvers McIvers Brook Dec 12, Mount Moriah Mount Moriah Trout Pond, Third Pond (2 Dec 09, intakes) Mount Pearl Mount Pearl Bay Bulls Big Pond Dec 12, Musgrave Harbour Musgrave Harbour Rocky Pond Nov 15, Nain Nain Trouser Lake Nov 28, Nameless Cove New Chelsea-New Melbourne-Brownsdale-Sibl ey's Cove-Lead Cove Nameless Cove / Flower French Island Pond Dec 14, Cove Sibley's Cove, Lead Cove Sibley's Cove Pond Dec 12, New Perlican New Perlican New Perlican River Dec 12, New-Wes-Valley Newtown-Templeton Carter's Pond Nov 15, Newman's Cove Newman's Cove Heale Pond Brook Nov 16, Norman's Cove-Long Cove Norman's Cove-Long Cove John Newhooks Pond Nov 10, Norris Point Norris Point Neddy Harbour Pond Dec 08, North West River North West River Wellfield (#1 & #3 Well) + Oct 07, #2 Well Old Perlican Old Perlican Bell Pond Dec 12, Paradise Paradise Bay Bulls Big Pond Dec 12, Parkers Cove Parkers Cove Unnamed brook Dec 07, Parson's Pond Parson's Pond Cold Brook Dec 07, Pasadena Pasadena Blue Gulch Pond Nov 02, Petit Forte Petit Forte Reddy's Pond Dec 07, Petty Harbour-Maddox Cove Petty Harbour-Maddox Cove Western Barrens Pond Dec 08, Piccadilly Head Piccadilly Head (+West Bay) Unnamed Brook Nov 22, Pidgeon Cove-St. Barbe Pigeon Cove - St. Barbe Long Pond Dec 14, Placentia Dunville Wyses Pond Dec 14, May 10, 2017 Page 4 of 7

5 Placentia Freshwater, Argentia site Clarkes Pond Dec 14, Placentia Placentia, Jerseyside, SE Larkins Pond Dec 14, Placentia Plum Point Plum Point Grand Pond Dec 14, Point Lance Point Lance Unnamed Pond Dec 14, Point May Point May Short's Pond Dec 06, Point May Point May - PWDU Short's Pond Dec 06, Pollards Point Pollards Point East George Ricks Pond Nov 23, Pollards Point Pollards Point, Country Cove Country Cove Pond Nov 23, Port Blandford Port Blandford Noseworthy's Pond Nov 16, Portland Creek Portland Creek Unnamed Streams Dec 07, Portugal Cove South Portugal Cove South Wrights Brook Dec 01, Portugal Cove-St. Phillips Portugal Cove-St. Phillips Bay Bulls Big Pond Dec 12, Postville Postville - PWDU Big Pond Nov 16, Pouch Cove Pouch Cove North Three Island Pond Nov 21, Pynn's Brook Pynn's Brook Pynn's Brook Dec 08, Ramea Ramea Northwest Pond Nov 29, Ramea Ramea - PWDU Northwest Pond Nov 29, Random Sound West Queen's Cove Reservoir Nov 14, Red Bay Red Bay Northern Brook Oct 05, Reidville Reidville Humber Canal, Grand Lake Nov 02, Rigolet Rigolet Rigolet Pond Nov 16, Rigolet Rigolet - PWDU Rigolet Pond Nov 16, River of Ponds River of Ponds Burnt Head Ponds Dec 15, Rocky Harbour Rocky Harbour Gull Pond Dec 08, Roddickton-Bide Arm Bide Arm First Clay Cove Pond Nov 29, Roddickton-Bide Arm Roddickton East Brook Pond Nov 29, Rose Blanche-Harbour Le Rose Blanche-Harbour Le Rose Blanche Brook Nov 01, Cou Cou Rushoon Rushoon Big Pond Brook Dec 07, Salmon Cove Salmon Cove Rocky Pond Nov 21, Salvage Salvage Wild Cove Pond Nov 23, Sheaves Cove Sheaves Cove Unnamed Brook Nov 22, Sheshatshui Sheshatshui - Indian Band Wells 1, 2 & 3 Oct 07, Council Sop's Arm Sop's Arm Little Tickle Pond Nov 23, South River South River Brigus Long Pond (to Nov 22, Brigus) Southern Harbour Southern Harbour Brigades Pond Nov 04, Spaniard's Bay Spaniard's Bay (+Upper Island Cove, + Bryant's Cove) Kelly's Pond (Spider's Pond) Nov 21, May 10, 2017 Page 5 of 7

6 St. Bernard's-Jacques St. Bernard's-Jacques Rattle Brook Dec 07, Fontaine Fontaine St. Bride's St. Bride's North Side Brook Dec 14, St. Bride's St. Bride's South Side Brook Dec 14, St. John's St. John's Windsor Lake Dec 08, St. John's St. John's Petty Harbour Long Pond Dec 08, St. John's St. John's (+Mt. Pearl, Bay Bulls Big Pond Dec 12, Paradise, +Portugal Cove-St. Phillips, +CBS) St. Judes St. Judes Uncle Arthur Brook Nov 02, St. Judes St. Judes Chute Brook Nov 02, St. Lawrence St. Lawrence - PWDU St. Lawrence River Dec 06, St. Lewis St. Lewis Tub Harbour Pond Oct 05, St. Pauls St. Pauls Two Mile Pond Dec 07, St. Shott's St. Shott's Unnamed Pond Dec 01, Steady Brook Steady Brook Wellfield and Steady Brook Nov 02, Steady Brook Steady Brook Wellfield and Steady Brook Dec 13, Stephenville Stephenville Well Field Nov 22, Sunnyside (T.B.) Sunnyside Center Cove River Nov 04, Terrenceville Terrenceville Big Brook Dec 05, Thornlea Thornlea Big Bakeapple Pond Nov 10, Trepassey Trepassey Broom Cove Pond Dec 01, Trepassey Trepassey Miller's Pond Dec 01, Trinity Trinity, T.B. Indian Pond Nov 15, Trinity Bay North Melrose Whirl Pond Nov 16, Trinity Bay North Port Union, Catalina (+Little Whirl Pond Nov 16, Catalina) Trout River Trout River Feeder Brook Nov 02, Upper Island Cove Upper Island Cove Kelly's Pond (Spider's Nov 21, Pond) Victoria Victoria (+Salmon Cove) Rocky Pond Nov 21, West Bay West Bay Unnamed Brook Nov 22, West Bay West Bay Victor's Brook Nov 22, West St. Modeste West St. Modeste Well Field Oct 05, Whitbourne Whitbourne Hodges River Nov 10, Whiteway Whiteway (+Cavendish) Long Pond Nov 30, William's Harbour William's Harbour Beaver Pond Nov 15, Winterton Winterton Western Pond Dec 12, Woody Point Woody Point Winterhouse Brook Nov 02, May 10, 2017 Page 6 of 7

7 What is the Langelier Index? The Langelier index (LI) is an approximate measure of the degree of saturation of calcium carbonate in water. It is calculated using the ph, alkalinity, hardness, total dissolved solids, and water temperature of a water sample collected at the tap. If the; LI is negative: The water is under saturated with calcium carbonate and will tend to be corrosive in the distribution system LI is positive: The water is over saturated with calcium carbonate and will tend to deposit calcium carbonate forming scales in the distribution system If LI is close to zero: The water is just saturated with calcium carbonate and will neither be strongly corrosive or scale forming. The LI is one of several tools used by the water operator for stabilizing water to control both internal corrosion and the deposition of scale. Experience has shown that LI in the range of -1 to +1 has a relatively low corrosion impact on metallic components of the distribution system. LI values outside this range may result in laundry stains or leaks. For additional information on the Langelier Index please contact the Department of Environment and Climate Change at May 10, 2017 Page 7 of 7