Washoe County, Nevada has about 507,280 residents (Census 2024 estimate) and 25 community water systems in EPA records. The largest local system is Truckee Meadows Water Authority, serving about 442,000 people from surface water.
! 1 of 6 largest systems with health-based violationsPFAS detected at 2 of 4 sampled systemsHardness 4.6 gpg (low confidence)
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
How hard is Washoe County water?
Truckee Meadows Water AuthorityEstimate: untreated local water, not your tap · Low confidence
4.6 gpg(79 mg/L), moderately hard
Washoe County: median of 3,893 results from 415 monitoring sites (streams and wells). Utilities may blend or treat water, so your tap can differ.
County estimates: Hard Water Map (hardwatermap.com), CC BY 4.0, derived from the USGS/EPA Water Quality Portal; file generated 2026-07-22. License
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
Softener size at 4.6 gpg
For a 3-person home using 57 gallons per person per day and regenerating weekly, you'd remove about 5,506 grains between regenerations. Suggested size: 24,000 grain. This uses a low-confidence county estimate, so confirm with a test first.
Estimate only. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
The 6 biggest of 25 community water systems on EPA records for this county. Service areas don't follow county lines; your water bill names your provider.
Truckee Meadows Water Authority
NV0000190 · serves about 442,000 people · Surface water
✓ No health-based violations✓ Lead below detectionPFAS detected (8 types)
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2023-01-01) Older result. Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
PFOS: highest sample 20 ppt (6 of 142 samples); federal limit 4.0 ppt as a running annual average
PFHxS: highest sample 15 ppt (18 of 142 samples); federal limit 10.0 ppt as a running annual average, also counted in EPA's PFAS mixture (hazard index) limit (currently in effect; EPA has proposed removing it)
PFPeA: highest sample 13 ppt (6 of 142 samples); no federal limit
PFHxA: highest sample 12 ppt (7 of 142 samples); no federal limit
PFBA: highest sample 6.8 ppt (1 of 142 samples); no federal limit
PFBS: highest sample 5.7 ppt (9 of 142 samples); no individual limit; counted in EPA's PFAS mixture (hazard index) limit
PFOA: highest sample 5.5 ppt (3 of 142 samples); federal limit 4.0 ppt as a running annual average
PFHpA: highest sample 3.9 ppt (1 of 142 samples); no federal limit
NV0000207 · serves about 9,910 people · Groundwater
! 1 health-based violation✓ Lead below detectionPFAS detected (3 types)
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2024-01-01). Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
PFPeA: highest sample 6.2 ppt (2 of 10 samples); no federal limit
PFBS: highest sample 5.1 ppt (1 of 10 samples); no individual limit; counted in EPA's PFAS mixture (hazard index) limit
PFHxA: highest sample 4.7 ppt (1 of 10 samples); no federal limit
NV0001086 · serves about 1,450 people · Groundwater
✓ No health-based violations✓ Lead below detectionPFAS: not sampled
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2024-01-01). Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
✓ No health-based violations✓ Lead below detectionPFAS: not sampled
Lead 90th percentile: <DL (below the lab detection/reporting limit; reported as 0) (period starting 2022-01-01) Older result. Action level: 15 ppb (drops to 10 ppb on Nov 1, 2027).
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
A PFAS detection is not a violation. Federal limits (4 ppt for PFOA and PFOS) apply to running annual averages, with compliance required by 2029. In May 2026 EPA proposed extending the PFOA/PFOS deadline to 2031 and removing other PFAS limits; not final as of 2026-10-21.
Test your own tap
These are public records for whole systems. Your home's pipes, fixtures and any private well can change what you drink. A certified lab test or a hardness test strip gives you your own numbers. Then use our PFAS and lead filter selector to see which certifications to look for.
Common questions about Washoe County water
Is tap water in Washoe County safe to drink?
1 of the 6 largest systems here have at least one health-based violation in EPA records since October 2021 (see each system below for status). Truckee Meadows Water Authority's most recent lead 90th percentile was below the lab detection limit (2023), below the 15 ppb action level. Public records can't guarantee what comes out of your tap, especially with older plumbing, so a home test is the surest check.
How hard is the water in Washoe County?
There's no published utility figure in our data, but untreated local stream and well samples in Washoe County have a median of about 4.6 grains per gallon (79 mg/L, moderately hard). That's a low-confidence estimate of source water, not your tap, so test before you buy equipment. For a 3-person home at 4.6 gpg, our softener calculator suggests a 24,000 grain unit as a starting point.
Is there PFAS in Washoe County water?
2 of the 4 sampled systems listed here detected at least one PFAS in EPA's UCMR 5 testing, and 3 results were above the level of a federal limit in at least one sample. A detection isn't a violation: federal PFAS limits apply to running annual averages starting in 2029.
Which water system serves my address in Washoe County?
Most homes are served by Truckee Meadows Water Authority or one of the other systems listed on this page, but service areas don't follow county lines. Your water bill names your provider, and its annual Consumer Confidence Report has the full test results.
Data as of October 21, 2026. Figures are copied from public records and combined with our own calculations; they can be out of date or wrong. Tapped Out isn't affiliated with any utility or the EPA. Written and reviewed by the Tapped Out team. How we calculate · All sources.