Well Acid Treatment & Rehabilitation Services

When a once-productive well starts producing less water each year, the cause is almost always invisible from the surface — mineral scale, iron fouling, and biological growth slowly choking the well screen and the formation around it. Mighton's Well Services performs licensed well acid treatment and rehabilitation across Simcoe County and Grey County, dissolving the deposits that block water flow and restoring yield to wells that homeowners and farm operators had begun to think needed replacement. Most rehabilitated wells regain 70 to 100 percent of their original production at a fraction of the cost of drilling new.

The science of well fouling is straightforward. Groundwater in our region carries dissolved calcium, iron, manganese, and a host of other minerals depending on the formation. When that water passes through a well screen and into the casing, small changes in pressure, temperature, and oxygen exposure cause those minerals to precipitate out of solution. Calcium carbonate forms hard white-grey scale on screens and casing walls. Iron oxidizes into rust-coloured deposits that build up over decades. Iron bacteria — naturally occurring microorganisms common across Simcoe County groundwater — feed on dissolved iron and produce slimy gelatinous biofilms that block screen openings completely. Manganese forms black deposits that stain fixtures and laundry. Left alone, these deposits compound over years until the well can no longer deliver enough water for normal household or farm use.

Acid treatment dissolves the deposits chemically without damaging the well structure. We use food-grade or industrial acids specifically approved for water-well rehabilitation under Ontario Regulation 903 — typically hydrochloric or sulfamic acid for calcium scaling, and citric or oxalic acid for iron fouling. The acid is introduced into the well, agitated to ensure contact with all fouled surfaces, given time to dissolve the deposits, and then thoroughly removed during well redevelopment. Critically, all acids are neutralized to safe pH before the well returns to service, and water quality testing confirms the well is safe to use. This is a regulated procedure performed by licensed well technicians — not something a homeowner should attempt with hardware-store chemicals, which can damage the well, contaminate the aquifer, or produce hazardous reactions.

Our rehabilitation methodology starts with diagnostics, not chemistry. Before we recommend any treatment, we measure the current static water level, perform a controlled drawdown test to determine actual well yield, and where possible run a downhole video camera to see the deposits directly. We test the water and any visible deposits to identify what minerals are present and at what concentrations — this tells us exactly which acid will dissolve the specific scaling. Only then do we develop a treatment plan with a clear cost estimate and an expected yield improvement. On treatment day, the pump is removed, the acid is introduced at the right concentration, mechanical agitation (surging or brushing) helps the acid reach every fouled surface, contact time allows complete dissolution, and the well is thoroughly redeveloped by pumping until the water runs clear and the pH returns to neutral. A water sample is sent for analysis before the well returns to service.

Seasonal timing affects rehabilitation in several ways. Summer and early fall are the ideal windows: lower water tables make access to the full well screen easier, warmer temperatures speed chemical reaction rates, and farms tend to have the most flexibility around peak irrigation demand. Winter rehabilitation is entirely workable for residential wells with insulated wellhouses or quick-access wellheads, though some acid types react slower in cold conditions. Spring rehabilitation can be challenging on rural properties with soft access roads. The most important seasonal consideration is not waiting until you have no water — emergency rehabilitation in February with a frozen ground and an unhappy household is a much harder service to schedule than a planned summer treatment on the same well.

Geology across our service area creates very different fouling patterns from one community to the next. Wells drawing from the limestone and dolostone aquifers of the Niagara Escarpment in Clearview, Blue Mountains, Meaford, and Mulmur are prone to severe calcium carbonate scaling — the same dissolved limestone that makes the local water "hard" precipitates out on every well screen over decades. Sandy aquifer wells in Wasaga Beach, Tiny Township, and Innisfil typically suffer iron fouling first because the shallow groundwater is rich in dissolved iron and iron bacteria thrive at the screen interface. Clay-overburden wells in Springwater and Essa Township often combine both problems with the added complication of fine particulate plugging. Deep bedrock wells in Oro-Medonte and Barrie can foul more slowly but are harder to rehabilitate because of the depth and the volume of acid required. We adapt the chemistry, the agitation method, and the contact time to the specific well — there is no single recipe that works everywhere.

Property owners weighing acid treatment against well replacement should understand a few key points. First, rehabilitation is dramatically less expensive than drilling a new well: a typical residential rehabilitation costs $2,500 to $6,000 compared to $15,000 to $25,000 or more for a new well plus pump installation. Second, rehabilitation does not always work — if the well casing has structural damage, the screen has corroded through, or the aquifer itself has declined, acid treatment will not restore yield. Our diagnostic process tells you upfront whether rehabilitation is the right call. Third, even a successful rehabilitation is not permanent — depending on the water chemistry and pump cycling patterns, wells in heavily-fouling formations may need treatment every 5 to 15 years. We document everything in a treatment report so the next service has the history to work from. Mighton's Well Services has rehabilitated hundreds of wells across Simcoe County and Grey County, and we provide honest assessments — including telling you when rehabilitation is not the right answer.