If Your Water Lab Report Lists a Perchlorate Number, What Does It Mean?
A laboratory report measuring perchlorate in your home's water provides a specific concentration value in micrograms per liter (µg/L). This figure represents the measured amount of perchlorate detected at your tap during testing. However, the number alone doesn't tell you whether your water has a health concern; it simply quantifies perchlorate presence at the sample time. It is essential to compare that value against local public system data and health guidelines to understand its context.
If You Have No Home Test Yet, What Can Fresno’s Public Water System Data Tell You?
The City of Fresno’s public water system, serving over 545,000 residents through surface water sources, underwent federal perchlorate occurrence monitoring from 2001 to 2005. In this survey of 417 samples, perchlorate was not detected above the reporting level of 4.0 µg/L in any instance. Furthermore, this system has no recorded health-based violations related to perchlorate. This indicates perchlorate levels in Fresno system water have historically remained below detectable thresholds in EPA's monitoring and below any established health standards.
Still, these system-wide results do not replace a test of your specific water supply. Since perchlorate measurements can vary by location and source, a certified laboratory test for your household water is the only way to determine your exact perchlorate concentration.
If You Want to Narrow Down Possible Sources Before Testing
Start by checking whether your water is from the municipal system versus a private well. Surface water supplied by Fresno’s municipal system has documented perchlorate monitoring with no detections above 4.0 µg/L in past EPA surveys. Private wells may have different profiles, so testing is especially important there. Additionally, review any water quality notices or reports your water supplier provides, which might mention perchlorate or other constituents.
Determining daily household water demand helps clarify the treatment capacity requirements if you plan to use a perchlorate removal device after knowing your test results.
If You Are Considering Treatment, What Changes Will You Observe at the Tap?
Using the C-Series Perchlorate Filter, a system documented specifically to address perchlorate, can reduce perchlorate levels effectively after samples quantify your household concentration. Once configured to your home's flow, water from your taps will have perchlorate removed to levels below detection. The taste and appearance of water generally remain unchanged since perchlorate itself is tasteless and odorless at low concentrations.
You may notice improved peace of mind about perchlorate presence, and your water’s suitability for household use increases. This technology ships ready to configure for your needs without requiring specialized fitting services.
If Your Water Report Shows Perchlorate Below Aesthetic Secondary Standards, Should You Worry?
Perchlorate does not have a federal secondary standard because it is not an aesthetic contaminant like those affecting taste or staining. It is a constituent with health-based concerns considered by regulatory agencies but does not cause taste or odor issues at typical environmental levels. Therefore, aesthetic secondary standards for water do not apply to perchlorate. This distinction means a detection of perchlorate tells you about chemical presence but not about any water appearance or taste issue linked to it.
How to Read a Certified Laboratory Test Report for Perchlorate
Your lab report will specify perchlorate concentration in micrograms per liter (µg/L) with an associated reporting limit. Values below the reporting limit might be listed as “not detected,” which means the test did not measure perchlorate above that threshold, not that perchlorate is absent. A value above the reporting level quantifies perchlorate presence but does not indicate a violation since no federal maximum contaminant level (MCL) exists for perchlorate. Interpretation depends on comparing this data to public water system monitoring and any applicable health guidance.
If perchlorate is detected in your home water, consider your household’s daily water volume to select a treatment device sized for your needs.
For households in Fresno concerned about perchlorate, the C-Series Perchlorate Filter offers a tested approach to reduce perchlorate levels once your specific water measurement is in hand and your daily water use known.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2002-08-21. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR1 monitoring (2001-2005) for FRESNO, CITY OF (CA1010007), CA: 417 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level