What contaminants are in POCATELLO tap water?

Public data sources identify the following contaminants in POCATELLO's water supply: Haloacetic acids (HAA9), Chromium (hexavalent), Total trihalomethanes (TTHMs), Nitrate, Haloacetic acids (HAA5), Radium, combined (-226 and -228), Uranium, Tetrachloroethylene (perchloroethylene), Barium, Trichloroethylene, Vanadium, Chlorate, Manganese, Strontium, Chromium (total), Lithium. Levels and comparison to EWG health guidelines are listed on the full city page.

Which water utility serves POCATELLO?

POCATELLO is served by POCATELLO CITY OF. POCATELLO CITY OF serves approximately 58,231 residents.

Tap Water Quality Report

Tap water quality in POCATELLO, Idaho

Q: Is the tap water in POCATELLO, Idaho safe to drink?

POCATELLO's tap water receives a grade of C (78/100) from TapWaterSafety.org. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline, Chromium (hexavalent) significantly above health guideline, Total trihalomethanes (TTHMs) significantly above health guideline. Grades are based on EPA SDWIS, EPA ECHO, EWG Tap Water Database, and the utility's published Consumer Confidence Report.

Served by POCATELLO CITY OF. 58,231 residents.

Average score 78/100

Utilities 1

Population 58,231

78/100

Average

ⓘ How did we get this rating?

Quick answer

Tap water in POCATELLO, Idaho receives a grade of C (78/100) from TapWaterSafety.org. It's served by POCATELLO CITY OF. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Chromium (hexavalent) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.

Data sources for this grade: utilities.csv EWG Tap Water Database ⓘ How did we get this rating?

What's in POCATELLO's tap water

Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving POCATELLO.

Haloacetic acids (HAA9) significantly above health guideline

Moderate concern

Haloacetic acids (HAA9) detected at 3.46 ppb, 58x above the EWG health guideline of 0.06 ppb.

Chromium (hexavalent) significantly above health guideline

Moderate concern

Chromium (hexavalent) detected at 0.8 ppb, 40x above the EWG health guideline of 0.02 ppb.

Total trihalomethanes (TTHMs) significantly above health guideline

Moderate concern

Total trihalomethanes (TTHMs) detected at 5.81 ppb, 39x above the EWG health guideline of 0.15 ppb.

EPA compliance record

Official U.S. EPA records for POCATELLO CITY OF (system ID ID6030043) for the last 3 years. Checked 2026-10-07.

No health-based violations. EPA recorded 6 quarters with a testing, reporting or notice violation.

6 of 12quarters with a violation

Nolead above EPA action level

11/13/2023last state inspection

Rule	Type	Since	Status
Ground Water Rule	Missed testing or reporting	10/09/2023	Open
Stage 1 Disinfectants and Disinfection Byproducts Rule	Missed testing or reporting	04/01/2025	Open

Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.

Recommended filters for POCATELLO

Filters matched to the specific contaminants in POCATELLO's water supply.

Carbon filter certified for VOCs (NSF/ANSI 53)

$180-$599

Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.

Aquasana AQ-5300 Under-Sink Filter

$180-$240 NSF 42, 53, 401, 372

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AquaTru Countertop Reverse Osmosis

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Aquasana OptimH2O Reverse Osmosis + Claryum

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Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.

All contaminants detected in POCATELLO's tap water

Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →

Contaminant	Detected	EWG US health-based	EPA US legal	EU DWD Europe	WHO global	CA PHG strictest US	Tested sample year	Status
Haloacetic acids (HAA9) Disinfection byproduct	3.46 ppb	0.06	—	—	—	—	—	58× over
Chromium (hexavalent) Heavy metal	0.8 ppb	0.02	—	—	—	—	—	40× over
Total trihalomethanes (TTHMs) Disinfection byproduct	5.81 ppb	0.15	80.0	100	—	—	—	39× over
Nitrate Inorganic	3.91 ppm	0.14	10.0	11.3	11.3	10	—	28× over
Haloacetic acids (HAA5) Disinfection byproduct	2.44 ppb	0.1	60.0	60	—	—	—	24× over
Radium, combined (-226 and -228) Radiological	1.14 pCi/L	0.05	5.0	—	—	—	—	23× over
Uranium Radiological	1.24 pCi/L	0.43	20.0	30	30	0.43	—	2.9× over
Tetrachloroethylene (perchloroethylene) Volatile organic compound	0.0365 ppb	0.06	5.0	—	—	—	—	Below guideline
Barium Heavy metal	128.0 ppb	700.0	2000.0	—	1300	2000	—	Below guideline
Trichloroethylene Volatile organic compound	0.0339 ppb	0.4	5.0	10	20	1.7	—	Below guideline
Vanadium Other	1.59 ppb	21.0	—	—	—	—	—	Below guideline
Chlorate Disinfection byproduct	3.86 ppb	210.0	—	—	—	—	—	Below guideline
Manganese Heavy metal	0.075 ppb	100.0	—	50	80	—	—	Below guideline
Strontium Radiological	0.38 ppb	1500.0	—	—	—	—	—	Below guideline
Chromium (total) Heavy metal	2.0 ppb	—	100.0	—	—	—	—	Below guideline
Lithium Other	38.6 ppb	—	—	—	—	—	—	Below guideline

All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.

Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.