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Tap water quality report

Gem State - Diamond Bar Estates

EPA monitoring tested this supplier for 38 contaminants and detected 6. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

38
contaminants tested
6
detected
143
people served
4
health-based violations
Idaho rankingsLead in IdahoPFAS in Idaho
Water source
Ground water
Ownership
Private
Counties served
Kootenai

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

4
health-based violations
12
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2012-11-01 → 2012-11-30
MCL Health-based Archived 2012-11-01 → 2012-11-30
MCL Health-based Archived 2012-11-01 → 2012-11-30
MCL Health-based Archived 2009-10-01 → 2009-10-31
MR Monitoring Resolved 2022-12-30
MR Monitoring Resolved 2022-12-30
MR Monitoring Resolved 2022-12-30
MR Monitoring Archived 2020-01-01 → 2020-12-31
MR Monitoring Archived 2020-01-01 → 2020-12-31
MR Monitoring Archived 2007-07-01 → 2007-07-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
3890 µg/L 39%
of the EPA limit 10000 µg/L
 32/32 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 10/10 LCR 2025
Nitrate-Nitrite
2030 µg/L 20%
of the EPA limit 10000 µg/L
 2/2 SYR4 2019
Arsenic
1.9 µg/L 19%
of the EPA limit 10 µg/L
 1/1 SYR4 2019
Barium
24 µg/L 1.2%
of the EPA limit 2000 µg/L
 1/1 SYR4 2019
Combined Uranium
4.24 µg/L 14%
of the EPA limit 30 µg/L
 1/1 SYR4 2016
32 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChromiumCombined Radium (-226 And -228)DichloromethaneEthylbenzeneFluorideGross Alpha, Excl. Radon And UMercuryNitriteSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
GEM STATE WATER CO
Phone
877-755-9287
Email
info@gemstate-water.com

Frequently asked questions about Gem State - Diamond Bar Estates

Is Gem State - Diamond Bar Estates tap water safe to drink?

EPA monitoring detected 6 contaminants in Gem State - Diamond Bar Estates's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Gem State - Diamond Bar Estates's water?

EPA monitoring detected Nitrate, Lead, Nitrate-Nitrite, Arsenic, Barium, and others. The full list with the level and data source for each is above.

How many people does Gem State - Diamond Bar Estates serve?

Gem State - Diamond Bar Estates reports serving 143 people in Idaho, per its EPA record.

Has Gem State - Diamond Bar Estates had any water quality violations?

The EPA has 12 violations on file for Gem State - Diamond Bar Estates, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.