Paradise Irrigation District has taken thousands of regulated and unregulated water samples during the past years to determine the presence of any radioactive, biological, inorganic, volatile and synthetic organic contaminants and monitor the treatment process. The tables below show only those contaminants that were detected in the water; some that were not detected are listed because our customers may be interested in seeing the results. The State Water Resources Control Board (State Board) requires us to monitor for certain substances less than once per year because the concentrations of these substances do not change significantly. In these cases, the most recent sample data are included, along with the year in which the sample was taken.
PRIMARY HEALTH STANDARDS |
Surface Water Supply | Groundwater Supply | ||||||
SUBSTANCE |
MCL |
YEAR SAMPLED |
AVERAGE |
RANGE |
YEAR |
AVERAGE |
RANGE |
MAJOR SOURCE IN DRINKING WATER |
INORGANIC |
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Chromium (Total) (ppb) |
50 | 2020 | ND | ND | 2014 | 3.4 | 3.4 | Erosion of natural deposits. |
Hexavalent Chromium (ppb) |
~ | 2015 | ND | ND | 2017 | 2.5 | 2.5 | Erosion of natural deposits. |
CLARITY |
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Turbidity (NTU) (prior to treatment) |
~ | 2021 | 0.66 | .31-2.81 | 2016 | 0.18 | 0.18 | Soil runoff. |
Turbidity (NTU) (TT) (treated water) |
0.2 | 2021 | 0.04 | 0.02-0.09 | NA | NA | NA | Soil runoff. |
Turbidity is a measurement of the cloudiness of the water. Turbidity measurement is a good indicator of the effectiveness of the filtration system. PID’s permit with State Drinking Division requires PID to deliver water with no more than 0.2 NTU.
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RADIOLOGICAL |
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Radium 228 (pCi/L) | 5 | 2017 | 2.2 | 2.2 | 2017 | 2.93 | 2.93 | Erosion of natural deposits. |
DISINFECTANT |
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Chlorine, Free Residual as Cl2 (ppm) (TT) |
4 | 2021 | 0.80 | 0 - 1.41 | NA | NA | NA | Water additive used to control microbes. |
DISINFECTANT BY-PRODUCTS |
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Trihalomethanes, Total (ppb) | 80 | 2021 | 35 | 24-52 | NA | NA | NA | Drinking water disinfection. |
Haloacetic Acids, Total (ppb) | 60 | 2021 | 50 | 26-83 | NA | NA | NA | Drinking water disinfection. |
DISINFECTANT BY-PRODUCT PRECURSOR |
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Total Organic Carbon (prior to treatment) |
~ | 2021 | 1.7 | 1.4-1.8 | NA | NA | NA | Decay of natural organic matter. |
UNREGULATED AND OTHER SUBSTANCES |
Surface Water Supply | Groundwater Supply | |||||
CHEMICAL |
YEAR SAMPLED |
AVERAGE DETECTED |
RANGE |
YEAR SAMPLED |
AVERAGE DETECTED |
RANGE |
MAJOR SOURCE IN DRINKING WATER |
Alkalinity as CaC03 (ppm) | 2020 | 30 | 30 | 2014 | 81 | 81 | Natural occurring substance. |
Bicarbonate Alkalinity (ppm) | 2020 | 40 | 40 | 2014 | 99 | 99 | Natural occurring substance. |
Calcium (ppm) | 2020 | 6 | 6 | 2014 | 15 | 15 | Natural occurring substance. |
Magnesium (ppm) | 2020 | 4 | 4 | 2014 | 9.3 | 9.3 | Natural occurring substance. |
Sodium (ppm) | 2020 | 3 | 3 | 2014 | 5.1 | 5.1 | Natural occurring substance. |
Chlorate (ppb) | 2015 | 260 | 120-400 | NA | NA | NA | Sodium Hypochlorite used for disinfection. |
pH | 2021 | 7.2 | 7-7.4 | 2017 | 7.3 | 7.3 | Slightly basic water. |
SECONDARY AESTHETIC STANDARDS |
Surface Water Supply | Groundwater Supply | ||||||
CHEMICAL (UNIT OF MEASURE) |
MCL |
YEAR SAMPLED |
AVERAGE DETECTED |
RANGE |
YEAR SAMPLED |
AVERAGE DETECTED |
RANGE |
MAJOR SOURCE IN DRINKING WATER |
Chloride (ppm) | 500 | 2020 | 2 | 2 | 2014 | 1.3 | 1.3 | Natural occurring substance. |
Hardness (ppm) | ~ | 2020 | 31.4 | 31.4 | 2014 | 76 | 76 | Naturally occurring substance. |
Sulfate (ppm) | 250 | 2020 | 1.4 | 1.4 | NA | NA | NA | Naturally occurring substance. |
Total Dissolved Solids (ppm) | 500 | 2020 | 70 | 70 | 2014 | 150 | 150 | Naturally occurring substance. |
CORROSIVITY |
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Specific Conductance (uS/cm) | 1600 | 2020 | 89 | 89 | 2014 | 160 | 160 | A measurement of water's conductance. |
Langelier Saturation Index * | Non-Corrosive | 2020 | -2.2 | -2.2 | NA | NA | NA | Indicator of corrosiveness of water. |
Aggressive Index | Non-Corrosive | 2020 | 9.6 | 9.6 | NA | NA | NA | Indicator of corrosiveness in water. |
Zinc (ppm)(TT) | 5 | 2020 | 0.47 | 0.47 | 2014 | NA | NA | Water additive used to control corrosion. |
Orthophosphate (ppm) (TT) | ~ | 2017 | 0.92-1.41 | 1.11 | NA | NA | NA | Water additive used to control corrosion. |
* The Langelier Saturation and Aggressive Indices and Specific Conductance are tests to measure the corrosivity of water. The results indicate that PID water is mildly corrosive. Zinc orthophosphate (ZOP) is added at the treatment plant to reduce the corrosiveness of the water on metallic pipes. |
Flouride is not added to the District's drinking water; fluoride concentration in the raw water is not detectable.
LEAD AND COPPER ANALYSIS |
Every three years PID is required to sample at the customers’ faucets for lead and copper. This monitoring ensures our water is not too corrosive and does not leach unsafe levels of these metals into your drinking water. Compliance measurements are from the 90th percentile (the level measured at 90% of homes sampled). See “Corrosivity” section.
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SUBSTANCE (UNIT OF MEASURE) | YEAR SAMPLED | VIOLATION? | AL | PHG (MCLG) | AMOUNT DETECTED (90th%TILE) |
SITES ABOVE AL/TOTAL SITES | TYPICAL SOURCE | |
Copper (ppm at the 90th percentile) | 2020 | No | 1.3 | 0.3 | 0.08 | 0/10 | Internal corrosion of household plumbing. | |
Lead (ppb at the 90th percentile) | 2020 | No | 15 | 0.2 | ND | 0/10 | Internal corrosion of household plumbing. |
TOTAL COLIFORM AND E.COLI SAMPLING IN 2020
MICROBIOLOGICAL CONTAMINANTS (AND REPORTING UNITS) |
HIGHEST |
# MONTHS IN VIOLATION |
MCL | IN COMPLIANCE? |
MAJOR SOURCE IN DRINKING WATER |
Total Coliform | 0 | 0 | 1 sample | Yes | Naturally present in environment. |
Fecal Coliform or E.coli (State Total Coliform rule) |
0 | 0 | A routine sample and a repeat sample are total coliform positive, and one of these is also fecal coliform or E.coli positive. | Yes |
Human and animal fecal waste. |
Fecal Coliform or E.coli (Federal Revised Total Coliform rule) |
0 | 0 | Routine and repeat samples are total coliform-positive and either is E.coli or system fails to take repeat samples following E.coli positive routine sample or system fails to analyze total coliform-positive repeat sample for E.coli | Yes | human and animal fecal waste. |
This Consumer Confidence Report (CCR) reflects changes in drinking water regulatory requirements during 2019. All water systems are required to comply with the state Total Coliform Rule. Beginning April 1, 2016, all water systems were also required to comply with the federal Revised Total Coliform Rule. The new federal rule maintains the purpose to protect public health by ensuring the integrity of the drinking water distribution system and monitoring for the presence of microbials (e.g., total coliform and E. coli bacteria). The U.S. EPA anticipates greater public health protection as the new rule requires water systems that are vulnerable to microbial contamination to identify and fix problems. Water systems that exceed a specified frequency of total coliform occurrences are required to conduct an assessment to determine if any sanitary defects exist. If found, these must be corrected by the water system.