PlainEnviro

Nampa Water Quality

Idaho

Health Violations

According to EPA SDWIS, Nampa, Idaho is served by 42 community water systems covering about 104,711 people. The same extract lists 89 health-based violation records, most recently coded 1005 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.

42
Water Systems
104,711
Population Served
89
Health-Based Violation Records
7
Distinct Contaminant Codes

Drinking water in Nampa, Idaho is delivered through 42 EPA-regulated community water systems serving an estimated 104,711 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.

PlainEnviro's health-based SDWIS extract shows 89 violation records across the 42 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 7 distinct EPA contaminant codes: Arsenic, Groundwater Rule, Gross Alpha, Excl. Radon and U, LEAD AND COPPER RULE REVISIONS, Revised Total Coliform Rule and 2 others. 11 TRI-reporting industrial facilities are also located within the city limits.

A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Idaho drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.

Community Water Systems

System Name Pop. Served Violations Status
NAMPA CITY OF 100,200 0 Clean
SHALIMAR SUBD 370 0 Clean
BELLE AIRE ACRES 2 350 0 Clean
EVERGREEN MOBILE PARK 284 5 Health
COVERT WATER USERS ASSOCIATION 250 0 Clean
ROLLING HILLS ESTATES WATER COMPANY 250 0 Clean
SUNNYRIDGE 3 WATER CORP 240 0 Clean
INDIAN VILLAGE 225 29 Health
LAKEVIEW HILLS WATER USERS ASSOCIATION 160 0 Clean
CAMELOT WATER ASSN INC 157 0 Clean
CLARK THEURER WATER ASSN 155 3 Health
LEISURE HEIGHTS HOMEOWNERS ASSOCIATION 142 0 Clean
OK WATER ASSN 140 0 Clean
SHAMROCK VILLA WATER ASSN 130 0 Clean
APACHE HEIGHTS SUBDIVISION (2) 110 0 Clean
SKY RANCH ESTATES 104 1 Health
KARCHER ACRES SUBD 100 1 Health
M & T WATER CORP 100 7 Health
NORTHSIDE ESTATES HOA INC 100 0 Clean
VERDE HILLS WATER USERS ASSN INC 95 0 Clean
WESTVIEW SHERVIK SUBD 78 2 Health
MANGUM HEIGHTS SUBD 75 3 Health
HORIZON RIDGE SUBDIVISION 75 0 Clean
VALLEY VIEW WATER 57 2 Health
BURNIE SUBD 55 0 Clean
M AND M MOUNTAIN VIEW SUBD EM2 54 0 Clean
SUNNYRIDGE PROPERTY OWNERS 53 5 Health
DAHL SUBD 51 0 Clean
LAKERIDGE SECOND SUBD 50 0 Clean
SKYLINE WATER ASSN 50 0 Clean
NORTHSTAR SUBDIVISION 50 7 Health
LINDENWOOD WATER ASSN 48 0 Clean
SILVER SPUR SUBDIVISION 44 0 Clean
LOCUST SUBD 42 4 Health
SHIPMAN PLACE SUBD 40 1 Health
SCENIC PROPERTIES WATER ASSN INC 40 0 Clean
SUNNYRIDGE I SUBD 35 10 Health
COUNTRY MEADOWS SUBD 35 0 Clean
SUNNYRIDGE SUBD 2 34 0 Clean
AURORA SUBD 30 0 Clean
TWIN BRIDGES SUBD 28 1 Health
RIVERVINE SUBDIVISION 25 8 Health

Does this city have health-based water violations?

These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.

Water system Contaminant Begin Date
INDIAN VILLAGE Arsenic 2025-10-01
INDIAN VILLAGE Arsenic 2025-07-01
INDIAN VILLAGE Arsenic 2025-07-01
INDIAN VILLAGE Arsenic 2025-04-01
INDIAN VILLAGE Arsenic 2025-04-01
SHIPMAN PLACE SUBD Groundwater Rule 2025-02-23
NORTHSTAR SUBDIVISION Gross Alpha, Excl. Radon and U 2025-01-01
INDIAN VILLAGE Arsenic 2025-01-01
INDIAN VILLAGE Arsenic 2025-01-01
RIVERVINE SUBDIVISION LEAD AND COPPER RULE REVISIONS 2024-10-17
RIVERVINE SUBDIVISION LEAD AND COPPER RULE REVISIONS 2024-10-17
NORTHSTAR SUBDIVISION LEAD AND COPPER RULE REVISIONS 2024-10-17
M & T WATER CORP LEAD AND COPPER RULE REVISIONS 2024-10-17
EVERGREEN MOBILE PARK LEAD AND COPPER RULE REVISIONS 2024-10-17
NORTHSTAR SUBDIVISION Gross Alpha, Excl. Radon and U 2024-10-01
NORTHSTAR SUBDIVISION Gross Alpha, Excl. Radon and U 2024-10-01
NORTHSTAR SUBDIVISION Gross Alpha, Excl. Radon and U 2024-10-01
INDIAN VILLAGE Arsenic 2024-10-01
INDIAN VILLAGE Arsenic 2024-10-01
INDIAN VILLAGE Arsenic 2024-10-01
INDIAN VILLAGE Arsenic 2024-07-01
INDIAN VILLAGE Arsenic 2024-07-01
INDIAN VILLAGE Arsenic 2024-07-01
NORTHSTAR SUBDIVISION Groundwater Rule 2024-05-02
NORTHSTAR SUBDIVISION Groundwater Rule 2024-05-02
INDIAN VILLAGE Arsenic 2024-04-01
INDIAN VILLAGE Arsenic 2024-04-01
INDIAN VILLAGE Arsenic 2024-04-01
INDIAN VILLAGE Arsenic 2024-01-01
INDIAN VILLAGE Arsenic 2024-01-01
INDIAN VILLAGE Arsenic 2024-01-01
INDIAN VILLAGE Arsenic 2024-01-01
INDIAN VILLAGE Arsenic 2024-01-01
INDIAN VILLAGE Arsenic 2023-10-01
INDIAN VILLAGE Arsenic 2023-10-01
INDIAN VILLAGE Arsenic 2023-10-01
INDIAN VILLAGE Arsenic 2023-10-01
LOCUST SUBD Groundwater Rule 2023-07-26
LOCUST SUBD Groundwater Rule 2023-07-26
INDIAN VILLAGE Arsenic 2023-07-01
INDIAN VILLAGE Arsenic 2023-07-01
INDIAN VILLAGE Arsenic 2023-07-01
INDIAN VILLAGE Arsenic 2023-07-01
WESTVIEW SHERVIK SUBD Revised Total Coliform Rule 2022-10-22
WESTVIEW SHERVIK SUBD Revised Total Coliform Rule 2022-10-22
SUNNYRIDGE I SUBD Arsenic 2022-07-01
SUNNYRIDGE I SUBD Arsenic 2022-07-01
SUNNYRIDGE I SUBD Arsenic 2022-07-01
SUNNYRIDGE I SUBD Arsenic 2022-07-01
SUNNYRIDGE I SUBD Arsenic 2021-01-01

What are Nampa's health-based records for?

Nampa's health-based violation records carry 7 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.

Contaminant Records Systems
Arsenic 37 2
Groundwater Rule 33 10
Revised Total Coliform Rule 7 5
Lead and Copper Rule Revisions 5 4
Gross Alpha, Excl. Radon and U 4 1
Nitrate 2 1
Coliform (TCR) 1 1

TRI Facilities in Nampa

Facility Total Releases
Amalgamated Sugar Co Nampa 3.2M lbs
Dubois Chemicals Inc. - Nampa Id 104.9K lbs
Sorrento Lactalis Inc. 29.2K lbs
301931-STEPHENS #2 (nampa) 986 lbs
Performix Nutrition Systems LLC 969 lbs
Oldcastle Infrastructure & Idaho Sand & Gravel 200 lbs
Plexus Manufacturing Solutions (boi) 138 lbs
Idaho Asphalt Supply Inc Nampa Plant 26 lbs
Hart & Cooley 22 lbs
Lippert Components Inc.- Plant 84 1 lbs

Frequently Asked Questions

What does EPA SDWIS list for drinking water in Nampa, Idaho? ▼
Nampa is listed with 42 EPA-regulated water systems covering approximately 104,711 people. 89 health-based violation records appear in the extract. A past registry row is not a current drinkability verdict; contact the local utility for current status.
How many water violations does Nampa have in this EPA extract? ▼
Nampa water systems have 89 health-based violation records in PlainEnviro's EPA SDWIS extract. This extract is filtered to EPA health-based records and does not include monitoring or reporting violations.
What contaminants were found in Nampa water? ▼
Health-based records for Nampa water systems carry the following EPA contaminant codes: Arsenic, Groundwater Rule, Gross Alpha, Excl. Radon and U, LEAD AND COPPER RULE REVISIONS, Revised Total Coliform Rule and 2 others. This source edition does not include authoritative contaminant names. Source: EPA SDWIS.
How many water systems serve Nampa? ▼
42 EPA-regulated community water systems serve Nampa, Idaho, collectively covering approximately 104,711 people. Data is from the EPA Safe Drinking Water Information System (SDWIS).
Where does Nampa get its drinking water? ▼
Nampa's water supply comes from 42 EPA-regulated community water systems. Source type data is not available for all systems. For detailed supply information, contact your local water utility. Source: EPA SDWIS.
Are there pollution sources near Nampa? ▼
Yes, 11 EPA Toxic Release Inventory (TRI) facilities are registered in Nampa, Idaho, reporting a combined 3.4M lbs of toxic chemical releases. TRI data reflects self-reported emissions; it does not measure exposure or health effects. Source: EPA TRI.

How does Nampa compare in Idaho?

Of the 216 Idaho places with at least one community water system on file, Nampa ranks #2 by number of systems (42).

Either side of it: Boise (48), Rathdrum (26), Idaho Falls (25)

About This Data

Figures here are the current EPA SDWIS extract joined to the 42 community water systems whose service area lists Nampa, ranked against the 216 Idaho places with at least one system on file. Data current as of 2026-08-25.

Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.

A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.

TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro