Leavitt Lake CSD

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: 950 people
Connections: 257
Water source: Groundwater
Based in: Susanville, CA
County: Lassen
Owner: Local government
Hardness: Hard

The ZIP code it serves

96130

The short answer

Nothing in EPA’s and California’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.

What was found

Nitrate, total trihalomethanes (TTHM), fluoride, arsenic, chromium (total) and haloacetic acids (HAA5): California’s own results, samples taken from May 19, 2020 to June 17, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits3

Nitrate

Comes from the source

Below EPA’s limits

2.8ppm

Highest sample; found in 10 of 13

2026, one sample: 0.9 ppm

The highest sample, in 2024, was 2.8 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 0.9 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.8 ppm, in 2017.

What handles it

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

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

2.1ppb

Highest yearly average, 2020 to 2026

2026 average: 1.4 ppb

Averaged by year, the highest was 2.1 ppb, in 2022, below EPA’s legal limit of 80 ppb. Its highest single sample was 2.7 ppb. In 2026, the latest year on file, its two samples averaged 1.4 ppb.

What handles it

NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.05ppm

Highest yearly average, 2026

Averaged by year, the highest was 0.05 ppm, in 2026, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.1 ppm. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.35 ppm, in 2017.

What handles it

NSF/ANSI 58 look for “Fluoride Reduction”
NSF/ANSI 53 look for “Fluoride”

4 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)
Lead

Hardness

Hard, 150 mg/L (8.8 grains per gallon), at its one sampling point, in 2025.

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 8.8 grains per gallon, salt included Softener or salt-free conditioner?California water hardness, utility by utility

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

Everything else. Nitrate, total trihalomethanes (TTHM), fluoride, 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. Leavitt Lake CSD’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 May 19, 2020 to June 17, 2026.

Testing your own tap

Leavitt Lake CSD’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.

No lab California certifies is within 75 miles of the area Leavitt Lake CSD serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 145 certified labs for California