Using Current Irish Drinking Water Legislation Identify the Parameters of Concern: Drinking Water Data Assignment, IT Sligo
| University | Institute of Technology (IT) Sligo |
| Subject | Drinking Water Data |
Your Task:
Attached are three sets of data from raw water samples. These are typical examples of waters that enter a drinking water treatment plant. Your task is to review the samples and complete the following tasks.
Part 1: For each sample complete the following;
- Using current Irish drinking water legislation identify the parameters of concern (parameters that exceed the limit set in the legislation)?
- To the best of your ability, interpret the data to determine the type of water sample and issues that might cause the exceedances.
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Part 2: Briefly, answer these specific questions;
- Biologically, what is the difference between cryptosporidium & coliform bacteria?
- What type of waters might have elevated levels of arsenic and why?
- What is ‘conductivity’ in waters, what is its limit in the current Irish legislation, and why do we monitor it?
- What is ‘turbidity’ and if we found it at a consumer’s tap what might it indicate?
Water Sample Number 1:
| Raw | Chlorinated | UV | Other |
| X |
| Part | Parameter | DWT Limit | Result | Notes |
| A. Microbiology | Coliforms | 0 cfu/100ml | 2420 | |
| E. coli | 0 cfu/100ml | <1 | ||
| C. perfringens | 0 cfu/100ml | 12 | ||
| B. Chemical | Arsenic | 10 ug/l | < 4.0 | |
| Boron | 1 mg/l | < 0.02 | ||
| Cadmium | 5 ug/l | < 1.0 | ||
| Chromium | 50 ug/l | < 4.0 | ||
| Copper | 2 mg/l | < 0.04 | ||
| Lead | 10 ug/l | < 4.0 | ||
| Nickel | 20 ug/l | < 4.0 | ||
| Nitrate | 50 mg/l | < 2.0 | ||
| Nitrite | 0.5 mg/l | < 0.02 | ||
| Pesticides | 0.5 ug/l (total) | – | ||
| Selinium | 10 ug/l | < 4.0 | ||
| C. Indicator | Aluminium | 200 ug/l | < 20 | |
| Ammonium | 300ug/l as NH4 | < 0.03 | ||
| Colour | Acceptable (NTU) | < 20 | ||
| Conductivity | 2500 us/cm | 518 | ||
| pH | 6.5 to 9.5 | 7.4 | ||
| Iron | 200 ug/l | 27 | ||
| Manganese | 50 ug/l | 91 | ||
| Odour | Acceptable | Non Detected | ||
| Turbidity | <1.0 NTU | 0.2 | ||
| Other | Hardness | N/A | 281 | |
| Alkalinity | N/A | 276 | ||
| Zinc | N/A | < 0.04 |
Water Sample Number 2:
| Raw | Chlorinated | UV | Other |
| X |
| Part | Parameter | DWT Limit | Result | Notes |
| A. Microbiology | Coliforms | 0 cfu/100ml | 261 | |
| E. coli | 0 cfu/100ml | 2 | ||
| C. perfringens | 0 cfu/100ml | 2 | ||
| B. Chemical | Arsenic | 10 ug/l | – | |
| Boron | 1 mg/l | – | ||
| Cadmium | 5 ug/l | – | ||
| Chromium | 50 ug/l | – | ||
| Copper | 2 mg/l | – | ||
| Lead | 10 ug/l | – | ||
| Nickel | 20 ug/l | – | ||
| Nitrate | 50 mg/l | 43.1 | ||
| Nitrite | 0.5 mg/l | < 0.02 | ||
| Pesticides | 0.5 ug/l (total) | – | ||
| Selenium | 10 ug/l | – | ||
| C. Indicator | Aluminium | 200 ug/l | < 20 | |
| Ammonium | 300ug/l as NH4 | < 30 | ||
| Colour | Acceptable (NTU) | 2.3 | ||
| Conductivity | 2500 us/cm | 847 | ||
| pH | 6.5 to 9.5 | 7.5 | ||
| Iron | 200 ug/l | 60 | ||
| Manganese | 50 ug/l | < 20 | ||
| Odour | Acceptable | Non Detected | ||
| Turbidity | <1.0 NTU | 1.2 | ||
| Other | Hardness | N/A | 450 | |
| Alkalinity | N/A | 336 | ||
| Zinc | N/A | – |
Water Sample Number 3:
| Raw | Chlorinated | UV | Other |
| X |
| Part | Parameter | DWT Limit | Result | Notes |
| A. Microbiology | Colifroms | 0 cfu/100ml | 24 | |
| E. coli | 0 cfu/100ml | 2 | ||
| C. perfringens | 0 cfu/100ml | 28 | ||
| Enterococci | 6 | |||
| Aerobic Colony Counts at 22DegC/72hrs | >300 | |||
| B. Chemical | Arsenic | 10 ug/l | 8.0 | |
| Boron | 1 mg/l | < 0.02 | ||
| Cadmium | 5 ug/l | < 1.0 | ||
| Chromium | 50 ug/l | < 4.0 | ||
| Copper | 2 mg/l | 0.3 | ||
| Lead | 10 ug/l | < 4.0 | ||
| Nickel | 20 ug/l | < 4.0 | ||
| Nitrate | 50 mg/l | 7.9 | ||
| Nitrite | 0.5 mg/l | < 0.02 | ||
| Pesticides | 0.5 ug/l (total) | – | ||
| Selenium | 10 ug/l | < 4.0 | ||
| C. Indicator | Aluminium | 200 ug/l | < 20 | |
| Ammonium | 300ug/l as NH4 | < 30 | ||
| Colour | Acceptable (NTU) | 8.5 | ||
| Conductivity | 2500 us/cm | 347 | ||
| pH | 6.5 to 9.5 | 7.7 | ||
| Iron | 200 ug/l | 46 | ||
| Manganese | 50 ug/l | < 20 | ||
| Odour | Acceptable | None Detected | ||
| Turbidity | <1.0 NTU | 0.5 | ||
| Other | Hardness | N/A | 202 | |
| Alkalinity | N/A | 176 | ||
| Zinc | N/A | 0.08 | ||
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