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Cameron County Water Quality Report

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Brownsville Public Utilities Board

2026 report with 2025 data; older tap sampling is dated separately

Results for Brownsville Public Utilities Board (TX0310001) within Cameron County. Other suppliers and private wells require their own reports or tests.

Your water at a glance

See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.

Hardness

Very hard

358mg/L as CaCO₃

Utility-reported average; range 341–374

USGS hardness category

BPUB result, about 20.9 grains per gallon. The separate SRWA supplier value is 109 mg/L.

2025 report data; BPUB tableView source

Chloramine

Reported level below MRDL

3.25mg/L

Annual average; range 0.50–5.90

MRDL 4 mg/L

The report marks no violation; an individual peak is not an annual average.

2025View source

TTHMs

Below report benchmark

48.1µg/L

Highest reported level; range 8.7–48.1

MCL 80 µg/L

BPUB table, separate from the SRWA supplier table.

2025View source

HAA5

Below report benchmark

17.3µg/L

Highest reported level; range 6.8–17.3

MCL 60 µg/L

2025View source

Fluoride

Below report benchmark

0.54mg/L

Highest reported level; range 0.45–0.54

MCL 4 mg/L

2025View source

Lead

90th percentile below action level

0µg/L

Reported 90th percentile; no sites over action level

Action level 15 µg/L

This percentile is not a result for every tap.

2022–2024View source

Water hardness by provider

The figures below are provider-specific. They are not a countywide average.

UtilityHardnessHardness source
358 mg/L as CaCO₃ · Very hard2025 report data; BPUB table
View Full Water ReportOpen the measured results, dates, comparisons and original utility report.

The numbers behind your report

Selected useful results—not a replacement for the utility’s complete report. Older measurements retain their original year.

Open the complete utility report ↗

What was measuredReported amountSample year / source dateHow to read it
Hardness358 mg/L as CaCO₃Utility-reported average; range 341–3742025 report data; BPUB tableView source ↗Very hard · USGS hardness categoryBPUB result, about 20.9 grains per gallon. The separate SRWA supplier value is 109 mg/L.
Chloramine3.25 mg/LAnnual average; range 0.50–5.902025View source ↗Reported level below MRDL · MRDL 4 mg/LThe report marks no violation; an individual peak is not an annual average.
TTHMs48.1 µg/LHighest reported level; range 8.7–48.12025View source ↗Below report benchmark · MCL 80 µg/LBPUB table, separate from the SRWA supplier table.
HAA517.3 µg/LHighest reported level; range 6.8–17.32025View source ↗Below report benchmark · MCL 60 µg/L
Fluoride0.54 mg/LHighest reported level; range 0.45–0.542025View source ↗Below report benchmark · MCL 4 mg/L
Lead0 µg/LReported 90th percentile; no sites over action level2022–2024View source ↗90th percentile below action level · Action level 15 µg/LThis percentile is not a result for every tap.
Copper0.109 mg/L90th percentile; no sites over action level2022–2024View source ↗90th percentile below action level · Action level 1.3 mg/L
Nitrate0.74 mg/LHighest reported level; range 0.65–0.742025View source ↗Below report benchmark · MCL 10 mg/L
PFASNot assessed No complete compound-specific assessment in this guideReport review: November 2026View source ↗No presence or absence conclusion · Separate testing neededThis guide does not classify PFAS as high, low or absent. Consult the original report and compound-specific data.

ppm ≈ mg/L; ppb ≈ µg/L; ppt ≈ ng/L in drinking water. Hardness in gpg = mg/L as CaCO₃ ÷ 17.1. ND means not detected at the method’s reporting limit—not zero.

MCL is a maximum contaminant level. MRDL is a disinfectant limit. Lead/copper action levels use system sampling percentiles and are not a safe-tap threshold. TTHM/HAA5 compliance uses locational annual averages.

PFOA/PFOS comparisons use EPA’s 4 ppt values. Historical detections are not a present compliance finding; EPA assesses compliance using running annual averages. Rule implementation is being reviewed. EPA PFAS benchmarks and implementation ↗

Hardness source ↗USGS hardness classification ↗

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Source water. Rio Grande surface water, supplemented by brackish groundwater treated by Southmost Regional Water Authority (SRWA).

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More about your local water

What this means for your home

Brownsville’s municipal results and the SRWA supplier results are reported separately.

The BPUB section of the 2026 report lists average hardness of 358 mg/L as calcium carbonate, with a 341–374 mg/L range. A separate SRWA supplier table reports 109 mg/L. This guide uses the BPUB figure and does not combine it with SRWA or apply it to Harlingen, San Benito or all Cameron County homes.

Filter vs. softener: what each doesPlan installation with your plumber

A useful local question

Why do Brownsville’s source reports show two different hardness values?

They describe different supplies. BPUB reports 358 mg/L on average, while the SRWA supplier table reports 109 mg/L. Confirm your retail utility and the water blend reaching your home before sizing a softener.

Sources and methodology

We keep each utility’s results separate, show the reported sample year, and distinguish averages, maxima and tap-sampling percentiles. Hardness classifications use USGS ranges. Missing data stays unknown.

Sources checked November 14, 2026

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