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Small Water Systems · Vancouver Island · Oct 24, 20262-minute read

Why Two Wells on One BC Water System Can Give Different Water

The CVRD found that one of the two new wells on its Saltair Water System, on Vancouver Island, carries more dissolved minerals than the other, and says groundwater quality can change with pumping and the seasons. Water can differ from one well to the next, even next door.

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The Saltair Water System, southeast of Ladysmith on Vancouver Island, now draws on Stocking Lake and two new wells. On October 13, 2026, the Cowichan Valley Regional District, which runs it, reported that one well has “higher levels of dissolved minerals that can affect taste.” It has cut that well’s share and reduced the chlorine it adds.

CVRD tested both wells before they went into service, but “groundwater quality can change over time with pumping and seasonal conditions.” The district’s results for one tap on Olsen Road show hardness rising from 17.4 milligrams per litre (mg/L) in July 2025, on lake water alone, to 172 mg/L on October 1, 2026, and dissolved solids (mostly minerals and salts) from 26 to 520 mg/L, past Health Canada’s taste-based objective of 500. Health Canada sets no health limit for hardness.

The October 1 sheet’s on-site and other readings disagree: conductivity, which rises with dissolved minerals, is 140.6 against 740 microsiemens per centimetre, and pH 9.18 against 6.68. The sheet does not say why.

That October sample also shows trihalomethanes (THMs), by-products of chlorine meeting organic matter, at 210 micrograms per litre. Health Canada’s limit, set for a lifetime of exposure, is 100, judged on a running yearly average of at least quarterly samples taken where levels are likely highest.

THMs at that tap predate the wells: the district’s 2025 annual report shows five results there, all over 100 (110 to 150), and calls THMs an “Ongoing issue in water system.” The October result is higher than any of them. The district says the water is safe to drink (its FAQ, last updated September 18) and that Ladysmith’s filtration, once connected, removes much of the lake’s organic material.

The Note: Two wells on the same system, or the same lot, do not promise the same water quality. Depth and rock pull from different paths underground, and the chemistry can shift after months of pumping. Test each well on its own, and read the entire lab report, not just page one.

Who should pay attention: Saltair customers and anyone whose household well has started to taste different.

What to do next: Saltair customers can report any new, sudden, or unusual change to CVRD Utilities; health questions go to Island Health. On a household well, test at least once a year and right away if the taste, colour, or clarity changes, and keep every result. A neighbour’s good test doesn’t mean yours is good too: geology, depth, and construction all matter.

Checked against: Current Water Supply Update - October 2026, the project page, its FAQ, and its September 2026 update, Saltair distribution testing results, October 1, 2026, the Saltair Water page, and the Saltair Water System’s 2025 annual report (Cowichan Valley Regional District); Operational Parameters and Trihalomethanes (Health Canada); Well water testing, HealthLinkBC File 05b · checked October 23, 2026

Updates: October 28, 2026 · Corrected: the district’s words are now quoted exactly, “Ongoing issue in water system.” An earlier version of this post added “the” inside the quotation.

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