Cache County Water Quality: 4 Cities Ranked by the Records

Name: Cache County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Cache County, Utah: 4 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Cache County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 3 systems of 4 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest16 µg/L

NORTH LOGAN CITY16 µg/LSample date: 2025-03-18 to 2025-12-17
SMITHFIELD CITY16 µg/LSample date: 2023-06-06 to 2024-01-29
LOGAN CITY WATER SYSTEM13 µg/LSample date: 2023-08-30 to 2024-07-16
HYRUM CITYNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-02-21 to 2023-08-23

Lead (90th percentile)Detected in 4 systems15 µg/L federal action level · US EPAHighest4 µg/L

SMITHFIELD CITY4 µg/LMonitoring period: 2026–2026 (still open)
HYRUM CITY3.4 µg/LMonitoring period: 2023–2025
NORTH LOGAN CITY2.7 µg/LMonitoring period: 2022–2024
LOGAN CITY WATER SYSTEM2.2 µg/LMonitoring period: 2021–2023

29 PFAS tested, none detected in any systemShow

Tested in these 4 systems: HYRUM CITY, LOGAN CITY WATER SYSTEM, NORTH LOGAN CITY, SMITHFIELD CITY

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorobutanoic acid (PFBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

4 cities

Cities ranked by the records

1
LoganLOGAN CITY WATER SYSTEM
No PFAS detectedLead below action level
Open city report →
2
HyrumHYRUM CITY
No PFAS detectedLead below action level
Open city report →
3
North LoganNORTH LOGAN CITY
No PFAS detectedLead below action level
Open city report →
4
SmithfieldSMITHFIELD CITY
No PFAS detectedLead below action level
Open city report →

Showing 4 of 4 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Cache CountyPFAS detected in 0 of 4 cities; none had a sample above a 2024 EPA limit

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Utah

Lead

0of 4 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Utah

Who supplies the county

Largest water systems

LoganLOGAN CITY WATER SYSTEM · UTAH03010
55,540 served
HyrumHYRUM CITY · UTAH03008
10,891 served
SmithfieldSMITHFIELD CITY · UTAH03020
10,223 served
North LoganNORTH LOGAN CITY · UTAH03015
8,500 served

Questions

Frequently asked

How does Cache County tap water compare across cities?

PurityMap ranks 4 cities in Cache County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Logan's main water system: LOGAN CITY WATER SYSTEM · PWSID UTAH03010 · Purity Score 97 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Cache County cities had a PFAS sample above a 2024 EPA limit?

None of the 4 Cache County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 0.

Is there lead in Cache County tap water?

Utilities report lead as a 90th-percentile result from home taps. 4 of 4 Cache County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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