Rosehill Water Treatment Plant - 2025 Annual Water Quality Report
This annual water quality report summarizes the quality of drinking water from the Rosehill Water Treatment Plant, drinking water system number 220002020, from Jan. 1 to Dec. 31, 2025.
This report satisfies the requirements of Ontario Regulation 170/03 - Drinking Water Systems.
Description of drinking water system
A conventional surface water treatment plant incorporates the following steps in its purification process:
- Zebra mussel control
- Travelling screens
- Coagulation
- Flocculation
- Sedimentation
- Filtration
- Disinfection
- pH correction
The plant has a rated daily flow capacity of 50,000 m3/day. Primary disinfection is achieved with sodium hypochlorite.
The Rosehill Water Treatment Plant supplies water to the Town of Fort Erie (260004904) in Niagara. The Rosehill Water Treatment Plant is located at 300 Rosehill Rd. in Fort Erie.
The water treatment chemicals used over this reporting period are:
- Sodium hypochlorite
- Aluminum sulphate
- Sodium hydroxide
Water treatment plant infrastructure / system infrastructure
Monetary expenses
To ensure safe and efficient operations, the following major repairs or upgrade projects took place:
- New Fort Erie elevated water tank - $6,837,152
- New intake and outfall - $114,685
- Intake pipe cleaning - $110,161
Summary of adverse water quality incidents
The following table summarizes the notices of adverse water quality incidents submitted in accordance with the Safe Drinking Water Act. Adverse water quality incidents are reported to the Spills Action Centre and the Medical Officer of Health.
| Incident date | Adverse condition | Corrective action | Notice of issue resolution |
|---|---|---|---|
| May 22 | Total coliform of 2 CFU/100mL on Ridgeway Distribution sample taken on May 20 at 11:40 am. Chlorine results were 0.85 mg/L free and 0.99 mg/L total. | Upon receipt of the initial adverse results, Town of Fort Erie staff were dispatched to flush at the nearest hydrant at 14 Ridgeway Rd. on Thursday, May 22. Samples were taken by Niagara Region staff upstream at the plant, at the source at the Ridgeway Distribution Sample Station, and downstream at the Stevensville Reservoir. Resamples showed no total coliform. |
May 26 |
| June 16 | Possible unmonitored filter effluent turbidity event. On June 16 at 4:18 p.m., Filter 4 at the plant was observed to have a visible alarm on the filter's turbidimeter transmitter. | The operator immediately shut the filter down. Upon reviewing the filter turbidity data, the turbidimeter transmitter failed at approximately 2:11 p.m. on June 16. During the two hours and seven minutes the filter was in operation in this state, it produced approximately 550 m3 of water to the clearwell. The operator also took a grab sample at the same time and it was 0.047 NTU. Instrumentation staff replaced and calibrated the transmitter on Filter 4 and operations placed the filter back into service. All coagulant and reservoir chlorine/CT processes were in service with no issues during this time. |
June 19 |
Water quality test results
Reported results that are shown with "ND" (non-detect) instead of a numerical value indicates that the sample result is below the lowest possible detection limit for the parameter.
Microbiological testing
Microbiological testing carried out under Schedule 10 of Ontario Regulation 170/03 - Drinking Water systems, during this reporting period.
| Location | Number of samples | Range of E. coli results (minimum number) - (maximum number) | Range of total coliform results (minimum number) - (maximum number) | Prescribed standard* | Unit of measure |
|---|---|---|---|---|---|
| Raw | 52 | 0 - 128 | 0 - 1,680 | Not applicable | CFU/100 ml |
| Treated | 107 | 0 | 0 | Not detectable | CFU/100 ml |
| Distribution | 158 | 0 | 0 - 2 | Not detectable | CFU/100 ml |
*Prescribed standards are copied from Ontario Regulation 169/03 - Ontario Drinking Water Quality Standards.
Heterotrophic plate count testing
Heterotrophic plate count testing (HPC) is conducted on some treated and distribution system samples. The heterotrophic plate count test is used as a tool to monitor overall quality, but the results are not indicators of water safety. There is no prescribed standard for heterotrophic plate count.
| Location | Number of samples | Range of HPC results (minimum number) - (maximum number) | Unit of measure |
|---|---|---|---|
| Treated | 107 | 0 - 3 | CFU/mL |
| Distribution | 158 | 0 - 5 | CFU/mL |
Operational testing
Operational testing carried out under Schedule 7 of Ontario Regulation 170/03 - Drinking Water Systems, during this reporting period. An analyzer continuously monitors the water treatment process and records results on a predetermined frequency. Where continuous monitors are used, 8,760 is reflected as the number of samples.
| Parameter | Number of samples | Range of results (minimum number) - (maximum number) | Unit of measure |
|---|---|---|---|
| Filter turbidity | 8,760 | 0.011 - 0.839 | NTU* |
| Treated chlorine | 8,760 | 0.40 - 2 | mg/L |
*NTU (nephelometric turbidity units) is a unit that measures the lack of water clarity.
Additional testing
Summary of additional testing and sampling carried out in accordance with the requirement of an approval, order or other legal instrument.
| Date of legal instrument issued | Location: parameter | Date sampled | Result value or range (minimum number) - (maximum number) | Requirement | Unit of measure |
|---|---|---|---|---|---|
| Municipal Drinking Water Licence Issue 12 Dec. 16, 2024 | Environmental discharge: free chlorine residual | Per event | 0 - 0.02 | < 0.02 | mg/L |
| Municipal Drinking Water Licence Issue 12 Dec. 16, 2024 | Environmental discharge: total suspended solids | Monthly (January to December) | < 3 - 17 | 25 (running annual average) | mg/L |
| Municipal Drinking Water Licence Issue 12 Dec. 16, 2024 | Raw: microcystin | Weekly (June to October) | ND - 0.00018 | 0.0015* | mg/L |
| Municipal Drinking Water Licence Issue 12 Dec. 16, 2024 | Treated: microcystin | Weekly (June to October) | ND | 0.0015* | mg/L |
*Prescribed standards are copied from Ontario Regulation 169/03 - Ontario Drinking Water Quality Standards.
Inorganic testing
Inorganic parameter testing carried out under Schedule 13 of Ontario Regulation 170/03 - Drinking Water Systems, during this reporting period. Inorganic substances include heavy metals and dissolved minerals that may be present in treated drinking water.
| Parameter | Number of samples | Last sample date | Range of results (minimum number) - (maximum number) | Prescribed standard* | Unit of measure | Exceedance |
|---|---|---|---|---|---|---|
| Antimony | 4 | Nov. 3 | ND |
0.006 | mg/L | No |
| Arsenic | 4 | Nov. 3 | ND | 0.01 | mg/L | No |
| Barium | 4 | Nov. 3 | 0.019 - 0.03 | 1 | mg/L | No |
| Boron | 4 | Nov. 3 | 0.021 - 0.037 | 5 | mg/L | No |
| Cadmium | 4 | Nov. 3 | ND | 0.005 | mg/L | No |
| Fluoride | 12 | Nov. 3 | ND - 0.08 | 1.5 | mg/L | No |
| Mercury | 4 | Nov. 3 | ND | 0.001 | mg/L | No |
| Nitrate | 12 | Nov. 3 | ND - 0.28 | 1 | mg/L | No |
| Nitrite | 12 | Nov. 3 | ND | 10 | mg/L | No |
| Selenium | 4 | Nov. 3 | ND - 0.0006 | 0.05 | mg/L | No |
| Sodium | 4 | Nov. 3 | 13 - 15.3 | 20 | mg/L | No |
| Uranium | 4 | Nov. 3 | ND | 0.02 | mg/L | No |
*Prescribed standards are copied from Ontario Regulation 169/03 - Ontario Drinking Water Quality Standards. The prescribed standard for sodium is copied from Ontario Regulation 170/03 - Drinking Water Systems.
Lead testing
Lead testing carried out under Schedule 15.1 of Ontario Regulation 170/03 - Drinking Water Systems, during this reporting period.
| Location type | Number of samples | Last sample date | Range of lead results (minimum number) - (maximum number) | Prescribed standard* | Unit of measure | Exceedance |
|---|---|---|---|---|---|---|
| Treated | 4 | Nov. 3 | ND - 0.0004 | 0.010 | mg/L | No |
| Distribution | 4 | Nov. 3 | ND | 0.010 | mg/L | No |
*Prescribed standards are copied from Ontario Regulation 169/03 - Ontario Drinking Water Quality Standards.
Organics testing
Organic parameter testing carried out under Schedule 13 of Ontario Regulation 170/03 - Drinking Water Systems, during this reporting period. Trace organic test parameters include: volatile organic substances, pesticides, solvents, dioxins, PCBs and disinfection by-products.
| Parameter | Number of samples | Last sample date | Range of results (minimum number) - (maximum number) | Prescribed standard* | Unit of measure | Exceedance |
|---|---|---|---|---|---|---|
| 1,1-Dichloroethylene (vinylidene chloride) | 4 | Nov. 3 | ND | 0.014 | mg/L | No |
| 1,2-Dichlorobenzene | 4 | Nov. 3 | ND | 0.2 | mg/L | No |
| 1,2-Dichloroethane | 4 | Nov. 3 | ND | 0.005 | mg/L | No |
| 1,4-Dichlorobenzene | 4 | Nov. 3 | ND | 0.005 | mg/L | No |
| 2,3,4,6-Tetrachlorophenol | 4 | Nov. 3 | ND | 0.1 | mg/L | No |
| 2,4,6-Trichlorophenol | 4 | Nov. 3 | ND | 0.005 | mg/L | No |
| 2,4-Dichlorophenoxy acetic acid (2,4-D) | 4 | Nov. 3 | ND | 0.1 | mg/L | No |
| 2-4 Dichlorophenol | 4 | Nov. 3 | ND | 0.9 | mg/L | No |
| 2-Methyl-4-chlorophenoxyacetic acid (MCPA) | 4 | Nov. 3 | ND | 0.1 | mg/L | No |
| Alachlor | 4 | Nov. 3 | ND | 0.005 | mg/L | No |
| Atrazine + N-dealkylated metabolites | 4 | Nov. 3 | ND | 0.005 | mg/L | No |
| Azinphos-methyl | 4 | Nov. 3 | ND | 0.02 | mg/L | No |
| Benzene | 4 | Nov. 3 | ND | 0.001 | mg/L | No |
| Benzo(a)pyrene | 4 | Nov. 3 | ND | 0.00001 | mg/L | No |
| Bromoxynil | 4 | Nov. 3 | ND | 0.005 | mg/L | No |
| Carbaryl | 4 | Nov. 3 | ND | 0.09 | mg/L | No |
| Carbofuran | 4 | Nov. 3 | ND | 0.09 | mg/L | No |
| Carbon tetrachloride | 4 | Nov. 3 | ND | 0.002 | mg/L | No |
| Chlorobenzene | 4 | Nov. 3 | ND | 0.03 | mg/L | No |
| Chlorpyrifos | 4 | Nov. 3 | ND | 0.09 | mg/L | No |
| Diazinon | 4 | Nov. 3 | ND | 0.02 | mg/L | No |
| Dicamba | 4 | Nov. 3 | ND | 0.12 | mg/L | No |
| Dichloromethane | 4 | Nov. 3 | ND | 0.05 | mg/L | No |
| Diclofop-methyl | 4 | Nov. 3 | ND | 0.009 | mg/L | No |
| Dimethoate | 4 | Nov. 3 | ND | 0.02 | mg/L | No |
| Diquat | 4 | Nov. 3 | ND | 0.07 | mg/L | No |
| Diuron | 4 | Nov. 3 | ND | 0.15 | mg/L | No |
| Glyphosate | 4 | Nov. 3 | ND | 0.28 | mg/L | No |
| HAA - Distribution (latest running annual average) | 12 | Dec. 1 | 0.019 | 0.080 (running annual average) | mg/L | No |
| Malathion | 4 | Nov. 3 | ND | 0.19 | mg/L | No |
| Metolachlor | 4 | Nov. 3 | ND | 0.05 | mg/L | No |
| Metribuzin | 4 | Nov. 3 | ND | 0.08 | mg/L | No |
| Paraquat | 4 | Nov. 3 | ND | 0.01 | mg/L | No |
| Pentachlorophenol | 4 | Nov. 3 | ND | 0.06 | mg/L | No |
| Phorate | 4 | Nov. 3 | ND | 0.002 | mg/L | No |
| Picloram | 4 | Nov. 3 | ND | 0.19 | mg/L | No |
| Polychlorinated Biphenyls (PCB) | 4 | Nov. 3 | ND | 0.003 | mg/L | No |
| Prometryne | 4 | Nov. 3 | ND | 0.001 | mg/L | No |
| Simazine | 4 | Nov. 3 | ND | 0.01 | mg/L | No |
| Terbufos | 4 | Nov. 3 | ND | 0.001 | mg/L | No |
| Tetrachloroethylene | 4 | Nov. 3 | ND | 0.01 | mg/L | No |
| THM - Distribution (latest running annual average) | 12 | Dec. 1 | 0.031 | 0.100 (running annual average) |
mg/L | No |
| Triallate | 4 | Nov. 3 | ND | 0.23 | mg/L | No |
| Trichloroethylene | 4 | Nov. 3 | ND | 0.005 | mg/L | No |
| Trifluralin | 4 | Nov. 3 | ND | 0.045 | mg/L | No |
| Vinyl Chloride | 4 | Nov. 3 | ND | 0.001 | mg/L | No |
*Prescribed standards are copied from Ontario Regulation 169/03 - Ontario Drinking Water Quality Standards.
Parameters exceeding prescribed half-standard
Any inorganic or organic parameter(s) that exceeded half the standard prescribed in Schedule 2 of prescribed standards documented in Ontario Regulation 169/03 - Ontario Drinking Water Quality Standards or prescribed standards documented within Ontario Regulation 170/03 - Drinking Water Systems for large municipal residential drinking water systems.
Sodium - prescribed standard is <=20*
| Result value or range (minimum number) - (maximum number) | Date of sample |
|---|---|
| 13 - 15.3 mg/L | Feb. 3 |
*Prescribed standards are copied from Ontario Regulation 169/03 - Ontario Drinking Water Quality Standards. The prescribed standard for sodium is copied from Ontario Regulation 170/03 - Drinking Water Systems.
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