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Tradewind Water Assoc.

What EPA’s and California’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
632 people
Connections
219
Water source
Groundwater
Based in
Weldon, CA
County
Kern
Owner
Private
Hardness
Very hard
The ZIP code it serves

93283

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Uranium, above the legal limit. 12 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2005 to 2026.

Uranium, nitrate, fluoride, total trihalomethanes (TTHM), arsenic, chromium (total) and haloacetic acids (HAA5): California’s own results, samples taken from March 11, 2020 to May 20, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Uranium

Comes from the source

Above the legal limit

30.1ppb

Highest yearly average, 2020 to 2026

2026 average: 30 ppb

Averaged by year, the highest was 30.1 ppb, in 2025, which EPA rounds to 30 ppb to compare: at its legal limit of 30 ppb, not above it. Its highest single sample was 43.2 ppb. In 2026, the latest year on file, its 15 samples averaged 30 ppb. EPA judges this limit at each sampling point, and recorded violations for uranium at this utility in 2021, 2022, 2024 and 2025. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 29.7 ppb, in 2016.

What handles it

Above the health goal1

Lead

Comes from pipes, often your own

Above the health goal

5.3ppb

90th percentile, 2024 to 2026

In the latest period, 9 in 10 homes sampled were at or below 5.3 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits3

Nitrate

Comes from the source

Below EPA’s limits

1.9ppm

Highest sample; found in 14 of 14

2025 average: 1.2 ppm

The highest sample, in 2024, was 1.9 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, its four samples averaged 1.2 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 2.9 ppm, in 2016.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.53ppm

Highest yearly average, 2023

Averaged by year, the highest was 0.53 ppm, in 2023, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.57 ppm. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.56 ppm, in 2016.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

5.7ppb

Highest yearly average, 2020 to 2025

2025 average: 2.2 ppb

Averaged by year, the highest was 5.7 ppb, in 2021, below EPA’s legal limit of 80 ppb. Its highest single sample was 6.6 ppb. In 2025, the latest year on file, its three samples averaged 2.2 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 15 ppb, in 2015.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Haloacetic acids (HAA5)

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best water filters for lead, ranked

Hardness

Very hard, typically 205 mg/L (12 grains per gallon), across 2 sampling points, 2019 to 2023.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared at 12 grains per gallon, salt includedSoftener or salt-free conditioner?California water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2025 to June 30, 202522 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2025 to March 31, 202522 PCI/LResolved
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Addressed
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2024 to Dec. 31, 202421 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2024 to Sept. 30, 202421 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2024 to June 30, 202421 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2022 to Dec. 31, 202222 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2022 to Sept. 30, 202223 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2022 to June 30, 202224 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2022 to March 31, 202223 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2021 to Dec. 31, 202123 PCI/LResolved
Lead and Copper RuleLead service lines were not replaced as required.EPA: Lead Service Line Replacement (LSLR)Jan. 1, 2018—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 3 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Uranium, nitrate, fluoride, total trihalomethanes (TTHM), arsenic, chromium (total) and haloacetic acids (HAA5) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Tradewind Water Assoc.’s own annual report, which it must send you every year, has the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; California’s results run from March 11, 2020 to May 20, 2026.

Testing your own tap

Tradewind Water Assoc.’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab California certifies.

The 3 labs California certifies closest to the area Tradewind Water Assoc. serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Pace Analytical Services, LLC dba BC Laboratories, Inc.

    Bakersfield, CA · about 44 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, radioactivity

    (661) 327-4911

  • Zalco Laboratories, Inc.

    Bakersfield, CA · about 44 miles

    Certified for bacteria, nitrate, metals, minerals and other inorganics, organic chemicals, disinfection byproducts

    (661) 395-0539

  • BSK Associates - Bakersfield Analytical Laboratory

    Bakersfield, CA · about 50 miles

    Certified for bacteria

    (661) 327-0671

All 145 certified labs for California

Sources

PWSID CA1500406. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Kern County

All California utilities

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