Chlorine in Pima County Water: Understanding Tucson’s Public Water Sampling Record
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How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The chlorine data for Tucson’s public water system (serving over 700,000 people) comes from ongoing groundwater sources sampled regularly by the city and reported to the EPA. This record covers a large network of over 190,000 service connections, reflecting composite water quality rather than conditions at any single home. Each reported figure averages results from multiple groundwater wells and sampling events, providing a broad view of the system’s chlorine levels rather than a fixed reading for one household.
A Worked Example: Reading the Record's Median and Range As a Homeowner Would
Suppose you want to understand what the recorded chlorine data means if your water tastes or smells like chlorine. The city’s water record includes median chlorine levels and the range found across samples, but these figures represent overall trends. For an individual home, your experience may differ because chlorine concentration can fluctuate depending on distance from treatment points and plumbing conditions. The median offers a middle value to expect, while the range shows the variation observed in sampled water across Tucson.
What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page
In this public system record, “detected” means chlorine was measured in samples, not that it exceeds any health or taste standard. The median chlorine level is the midpoint of all measured values, and the range spans the highest and lowest chlorine concentrations noted during testing. These terms describe the system-wide presence and variability of chlorine as a disinfectant, not a safety concern or violation. Tucson’s water system shows no EPA health-based violations related to chlorine or any other constituent.
What Distinguishes This Problem From the Two Problems Most Often Confused With It
Chlorine taste or smell is often confused with other water issues such as sulfur odors or iron staining. Unlike sulfur, which comes from natural sources in groundwater, and iron, which causes discoloration and sediment, chlorine is intentionally added to control microbial growth and ensure water safety. Chlorine’s distinctive sharp taste or smell can be more noticeable in some homes due to plumbing materials or water stagnation, but it does not indicate a health hazard according to the system records.
How Public-System Records Differ From Private-Well Testing in What They Establish
Tucson’s public water system reports chlorine levels reflecting treated groundwater in its distribution network. These data do not directly apply to private wells, which may have very different chemistry and no added chlorine. For homeowners on city water, this record helps gauge typical chlorine presence but cannot pinpoint individual household levels. Only testing water from your own tap can provide precise information about chlorine or other tastes and odors specific to your home.
How Seasonal or Multi-Year Variation Shows in the Record (Dates and Ranges Given)
The EPA record includes data through late 2023, showing consistent water management over time with no health-based violations. Chlorine levels in the distribution system may vary seasonally, often adjusted to maintain microbial safety throughout the year. This long-term data helps identify stable treatment practices but does not capture day-to-day fluctuations individual homes might notice.
In summary, Tucson’s public water system data provides a broad and reliable overview of chlorine presence for over 700,000 residents in Pima County. While chlorine taste and smell can be a household concern, this record clarifies the water system’s consistent treatment approach without health-based violations. For homes seeking relief from chlorine’s aesthetic effects, the C-Series Chlorine Taste & Smell Filter ships ready to configure and can reduce these qualities effectively when tested and confirmed necessary by the homeowner.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2023-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for TUCSON CITY OF (AZ0410112), groundwater supply, serving 732906 people: 0 health-based violations of 164 total; lead 90th percentile 0.000649 mg/L