Water & Sewer

Community Wells

Lynden Precautionary Drinking Water Advisory Officially Lifted

Drinking Water Advisory issued by Hamilton Public Health Services in September 2011, for the presence of intermittent lead in the drinking water system, has now been officially lifted.

If you live in Carlisle, Freelton, Greensville or Lynden, your water comes from the groundwater in an aquifer. Groundwater is formed when rain and other precipitation moves down through the soil, sediment and rock until it reaches the water table. In Carlisle and Freelton, water is pumped and stored in water towers.


The Carlisle water supply system consists of four wells, one elevated water storage tank, treatment, sampling and analysis, which services a population of approximately 1,833 people. 


The Freelton water supply system consists of two wells, one elevated water storage tank, treatment, sampling and analysis which services a population of approximately 800 people.


The Greensville water supply system consists of one well, one well station, treatment, sampling and analysis which services a population of approximately 108 people.


The Lynden ground water supply system consists of one well, one well station, treatment, sampling and analysis which services a population of approximately 390 people.

Additional Information

As part of a pilot project, Hamilton Water will be transitioning Carlisle, Freelton, Greensville and Lynden from a manual water meter reading system to an Advanced Metering Infrastructure (AMI) system. This reliable and proven technology will allow us to provide more accurate reads and better customer service and support to your community.

Learn more about Advanced Metering Infrastructure

A Low Level Water Condition is declared due to lack of rainfall and low flows in local rivers and streams. Under these conditions there is a potential for water supply problems. The Low Water levels are set out in the Ontario Low Water Response Plan when watershed conditions are less than a certain threshold. A combination of below average precipitation along with hot summer temperatures can result in the water levels dropping below normal. In this case a Low Level Water Condition will be issued for your watershed.

Learn more about Low Level Water Conditions

Many rural residents rely on private wells and cisterns as their drinking water source. With an estimated 10,000 private wells and cisterns in use in Hamilton, it is important that we take care of this drinking water source. The condition of private water wells and safety of its water is the responsibility of the well owner.

Learn more about testing and maintaining your private well or cistern, as well as information on available funding for decommissioning abandoned wells.

As part of a community that relies on ground water as their source of drinking water you are considered a vulnerable area. Source water protection ensures water resources such as lakes, rivers and groundwater are protected from contamination or overuse.

Learn more about the source water protection plan, policies and what you can do to help protect your water source.

The City provides treated water to residents in communities that use groundwater as their drinking water source.

Learn more about the water treatment process for your community

Sodium is a mineral that can be found in drinking water supplies. Due to its high solubility, sodium is naturally found in groundwater with concentration levels ranging between 6 mg/L and 130 mg/L (Bond, R.G. and Struab, C.P., 1973). All groundwater contains some sodium because most rocks and soils contain sodium compounds from which sodium is easily dissolved.

Regulating Sodium in Our Drinking Water

The Guidelines for Canadian Drinking Water Quality and Ontario Drinking Water Standards set an aesthetic objective of 200 mg/L. Sodium concentrations above 200 mg/L may alter the taste of water. The Ontario Drinking Water Systems Regulation 170/03 under the Safe Drinking Water Act requires reporting to the local Medical Officer of Health when sodium levels in public drinking water supplies exceed 20 mg/L or more. At this point, the local Medical Officer of Health informs local physicians, as such information is intended to help persons on sodium-restricted diets control their sodium intake.

The Ontario Drinking Water Systems Regulation 170/03 requires Hamilton Water to test municipal drinking water supplies for sodium every 57 months and report concentrations that exceed 20 mg/L to the Medical Officer of Health. When sodium samples in drinking water exceed 20 mg/L, the Medical Officer of Health notifies health professionals and residents who might be on sodium-restricted diets. In line with this testing, the City of Hamilton sends out letters to the communities of Carlisle, Freelton, Greensville and Lynden with specifics of the sodium levels present in their water. The last letter was sent in June 2020. Municipal drinking water reports, including sodium levels, can be found in the “Drinking Water Annual Quality Reports” at www.hamilton.ca/waterquality.

Sodium intake and your health

Sodium is essential to your diet for normal nerve and muscle function, regulating fluid levels, and maintaining blood pressure. The World Health Organization estimates suggest that a total daily sodium intake of 120-400 mg will meet the daily needs of young children, and 1500 mg for most adults” (WHO, 1996).

Sodium in drinking water is not a health concern for most people but may be an issue for someone with severe hypertension, congestive heart failure or on a sodium-restricted diet. Water softeners may increase the levels of sodium in drinking water. It is not recommended to use water from a water softer to prepare infant beverages, including formula and juice. For drinking water purposes, it is recommended to have a separate water line that bypasses the water softener.

Sodium in food, occurs naturally and varies significantly in different types of food. The main source of sodium in the diet comes from processed foods, such as snack foods, fast foods, processed meats, soups, crackers, and condiments. If you are following a sodium restricted diet, all sources of sodium need to be considered.

Value per 100g of Edible Portion

Food Sodium (mg)
8 baby carrots 62
Hot Dog (plain) 684
Processed tomato juice (1 cup) 691
1% milk (1 cup) 113
1 x banana (medium) 1
Egg (1 x medium) 63
Apple juice (1cup) 18
Cheddar Cheese (50g) 310
Salt (1 teaspoon) 2,373
Chicken Noodle Soup (1 cup) 1,169

These reports contain information specific to your drinking water system including the monthly water production and results of the testing that is done.

View the annual drinking water reports

The City of Hamilton strives to protect its groundwater source, as it is your source of water. It is important to remember that your water is supplied through groundwater from an aquifer. It is not an unlimited source. Below are some different ways to help conserve water and protect the aquifer.