Is Pine Ridge Water System water safe to drink?

Pine Ridge Water System (PWS ID: 084690475) has 114 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. EPA SDWIS lists this system's service population as 7,482 people using Groundwater sources.

How many people does Pine Ridge Water System serve?

EPA SDWIS reports that Pine Ridge Water System serves 7,482 people (this public water system's service population, not the municipal population of Pine Ridge or any other city). It is a Native American-owned system using Groundwater water sources with 1,151 service connections. The operator address is listed in Pine Ridge, EPA Region 8 — Tribal Water Systems.

What type of violations does Pine Ridge Water System have?

Pine Ridge Water System has 114 total violations: 23 health-based violations (MCL exceedances or treatment failures), 90 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Pine Ridge Water System water?

No. Pine Ridge Water System was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.

What water source does Pine Ridge Water System use?

Pine Ridge Water System uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Where does this data come from?

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Where does Pine Ridge Water System sit among U.S. public water systems?

According to EPA SDWIS population_served among sitemap-advertised systems (serving 500+), Pine Ridge Water System ranks #5,895 of 29,740 by people served, and #2 of 55 in EPA Region 8 — Tribal Water Systems. Ordinals use population_served DESC among systems serving 500+ (the sitemap cohort). See /methodology#corpus-placement.

How does Pine Ridge Water System's violation count compare nationally?

Pine Ridge Water System has 114 recorded EPA SDWIS violations, fewer than 24% of the 29,740 public water systems serving 500 or more people nationwide (the same sitemap cohort used for the corpus-placement ranking above). 76% of that cohort has fewer violations than Pine Ridge Water System. A system can have zero recorded violations and still be actively monitored, and a high violation count often reflects a system that reports thoroughly, not necessarily one with worse water.

States → EPA Region 8 — Tribal Water Systems

Community Water System · PWS 084690475

Pine Ridge Water System

Operator location Pine Ridge, EPA Region 8 — Tribal Water Systems - larger served population (> 3,309) at 7,482 people served; 114 SDWIS violations on record from groundwater sources.

Compiled by PlainWater · May 15, 2026

7,482
People served (this PWS) Larger third of systems: 114
EPA violations (this PWS) Upper third of systems: 23
Health-based (this PWS) Middle third by health-based share: No PFAS
UCMR5 (this PWS) Tested, none detected

Follow published updates (RSS)

Pine Ridge Water System standing, high SDWIS violation third

7,482 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 20% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #5,895 of 29,740 among systems serving 500+.

The verdict

Pine Ridge Water System sits in the upper third of the sitemap cohort by violation count (114), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (7,482; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 20% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.

#5,895 of 29,740
Population · /systems: #2 of 55
Population · 08: 114
Total EPA violations on record: 20%
Health-based (MCL / treatment failure)

Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.

Water Safety Score

13/100

Pine Ridge Water System

Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.

Health-based violations F

EPA SDWIS health-based violations on record (MCL, MRDL, treatment technique)

Monitoring & reporting violations F

Non-health SDWIS violations (monitoring, reporting, and other compliance)

PFAS contamination N/A

Tested, none detected

Highest PFAS compound level detected in UCMR5 testing

System Details

System Type: Community
Owner Type: Native American
Connections: 1,151
School/Daycare: No
MCL Violations: 22
Monitoring Violations: 90
Treatment Tech Violations: 1

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Coliform (TCR)	MCL	21	1999
Coliform (TCR)	MR	18	1997
Barium	MR	3	1996
Cadmium	MR	2	1996
Arsenic	MR	2	1996
Fluoride	MR	2	1996
Chromium	MR	2	1996
Gross Alpha, Excl. Radon and U	MR	2	1982
Nitrate	MR	2	1998
Selenium	MR	2	1996
Mercury	MR	2	1996
Groundwater Rule	TT	1	2018
Combined Uranium	MCL	1	2019
CYANIDE	MR	1	1996
Heptachlor epoxide	MR	1	1996
o-Dichlorobenzene	MR	1	1998
Di(2-ethylhexyl) adipate	MR	1	1996
Benzo(a)pyrene	MR	1	1996
HEXACHLOROBENZENE	MR	1	1996
OXAMYL	MR	1	1996
Di(2-ethylhexyl) phthalate	MR	1	1996
1,1-Dichloroethylene	MR	1	1998
CHLOROBENZENE	MR	1	1998
Xylenes, Total	MR	1	1998
Dinoseb	MR	1	1996
1,1,1-Trichloroethane	MR	1	1998
2,4,5-TP	MR	1	1996
1,2-DIBROMO-3-CHLOROPROPANE	MR	1	1996
Simazine	MR	1	1996
Picloram	MR	1	1996

Violation Count vs. the National Corpus

Pine Ridge Water System has 114 recorded EPA violations, 76% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 24% carry more. 20% of this system's own violations are health-based (23 of 114), and it ranks #5,895 of 29,740 by population served among that same cohort.

EPA violations vs. the national water-system corpus

Public water systems serving 500+ people (EPA SDWIS)

114 Higher than most more violations than 76% of 29,740 water systems

the national water-system corpus, bucketed by value

Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source EPA SDWIS · 2026-05-15

How many violations vs. how serious, among peer systems

Pine Ridge Water System plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.

30 public water systems (500+ people served), EPA SDWIS current release.

How to read this

Each dot is one public water system; the highlighted dot is Pine Ridge Water System. A system to the right has more recorded violations; a system higher up has a larger share of those violations classified health-based rather than monitoring or reporting.

Rare but serious: few violations, but most of them are health-based.
Frequent, mostly paperwork: many violations, but mostly monitoring or reporting, not health-based.
Clean record: below-median on both counts, the tinted corner.

View all 30 systems as a list

City of Ballinger: 372 violations, 85% health-based
Nooksack Valley Water Association: 16 violations, 31% health-based
Montgomery Co RWD 12: 7 violations, 29% health-based
Irvin Water District #6: 11 violations, 27% health-based
Ticonderoga WD: 47 violations, 26% health-based
Pine Valley Plantation: 37 violations, 24% health-based
Pine Ridge Water System: 114 violations, 20% health-based (this system)
McLouth, City Of: 29 violations, 17% health-based
Kipling Oaks 1: 25 violations, 16% health-based
South Deerfield Water Supply District: 96 violations, 16% health-based
Sunset Ridge Water District: 82 violations, 15% health-based
Orange Water Dept: 136 violations, 14% health-based
Mount Pleasant Water Sys #1: 167 violations, 11% health-based
Lake Gibson Estates: 42 violations, 2% health-based
Benson Culinary Improvement District: 212 violations, 1% health-based
Conemaugh Twp Muni Auth: 567 violations, 1% health-based
Miccosukee Service Plaza: 0 violations, 0% health-based
Brazoria - Fort Bend Counties MUD 3: 0 violations, 0% health-based
Tanglewilde Thompson Place 600: 2 violations, 0% health-based
Center Water Co: 5 violations, 0% health-based
Spring Mills Elem School/Hvs: 9 violations, 0% health-based
Great Bend Industrial Park: 14 violations, 0% health-based
Glen Park Village: 19 violations, 0% health-based
Camp Is-Sho-Da: 22 violations, 0% health-based
Hamilton: 33 violations, 0% health-based
Town of Welaka: 54 violations, 0% health-based
Township of Blairstown Dpw: 61 violations, 0% health-based
McIntosh Water & Fire Pro Authority: 71 violations, 0% health-based
Clarkdale Municipal Water System: 114 violations, 0% health-based
Eureka Water Association: 273 violations, 0% health-based

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 174 samples detected PFAS.

Contaminant	Date	Result	MRL	Status
PFMBA	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
HFPO-DA	9/19/2023	<5.00 ppt	5.00 ppt	Not Detected
PFBA	9/19/2023	<5.00 ppt	5.00 ppt	Not Detected
PFHpS	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
6:2 FTS	9/19/2023	<5.00 ppt	5.00 ppt	Not Detected
4:2 FTS	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
8:2 FTS	9/19/2023	<5.00 ppt	5.00 ppt	Not Detected
NFDHA	9/19/2023	<20.00 ppt	20.00 ppt	Not Detected
PFPeA	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
PFEESA	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
ADONA	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
PFDA	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
PFMPA	9/19/2023	<4.00 ppt	4.00 ppt	Not Detected
PFTrDA	9/19/2023	<7.00 ppt	7.00 ppt	Not Detected
PFPeS	9/19/2023	<4.00 ppt	4.00 ppt	Not Detected
PFBS	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
PFHpA	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
PFHxS	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
PFNA	9/19/2023	<4.00 ppt	4.00 ppt	Not Detected
PFHxA	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
NEtFOSAA	9/19/2023	<5.00 ppt	5.00 ppt	Not Detected
9Cl-PF3ONS	9/19/2023	<2.00 ppt	2.00 ppt	Not Detected
PFTA	9/19/2023	<8.00 ppt	8.00 ppt	Not Detected
PFOS	9/19/2023	<4.00 ppt	4.00 ppt	Not Detected
PFOA	9/19/2023	<4.00 ppt	4.00 ppt	Not Detected
PFDoA	9/19/2023	<3.00 ppt	3.00 ppt	Not Detected
PFUnA	9/19/2023	<2.00 ppt	2.00 ppt	Not Detected
11Cl-PF3OUdS	9/19/2023	<5.00 ppt	5.00 ppt	Not Detected
NMeFOSAA	9/19/2023	<6.00 ppt	6.00 ppt	Not Detected
PFTA	7/26/2023	<8.00 ppt	8.00 ppt	Not Detected
PFTrDA	7/26/2023	<7.00 ppt	7.00 ppt	Not Detected
NEtFOSAA	7/26/2023	<5.00 ppt	5.00 ppt	Not Detected
NMeFOSAA	7/26/2023	<6.00 ppt	6.00 ppt	Not Detected
PFTrDA	7/12/2023	<7.00 ppt	7.00 ppt	Not Detected
PFTA	7/12/2023	<8.00 ppt	8.00 ppt	Not Detected
NEtFOSAA	7/12/2023	<5.00 ppt	5.00 ppt	Not Detected
NMeFOSAA	7/12/2023	<6.00 ppt	6.00 ppt	Not Detected
PFNA	7/12/2023	<4.00 ppt	4.00 ppt	Not Detected
9Cl-PF3ONS	7/12/2023	<2.00 ppt	2.00 ppt	Not Detected
PFUnA	7/12/2023	<2.00 ppt	2.00 ppt	Not Detected
PFHxA	7/12/2023	<3.00 ppt	3.00 ppt	Not Detected
PFDoA	7/12/2023	<3.00 ppt	3.00 ppt	Not Detected
PFDA	7/12/2023	<3.00 ppt	3.00 ppt	Not Detected
ADONA	7/12/2023	<3.00 ppt	3.00 ppt	Not Detected
PFOS	7/12/2023	<4.00 ppt	4.00 ppt	Not Detected
PFHpS	7/12/2023	<3.00 ppt	3.00 ppt	Not Detected
PFHxS	7/12/2023	<3.00 ppt	3.00 ppt	Not Detected
PFHpA	7/12/2023	<3.00 ppt	3.00 ppt	Not Detected
PFPeS	7/12/2023	<4.00 ppt	4.00 ppt	Not Detected
NMeFOSAA	7/12/2023	<6.00 ppt	6.00 ppt	Not Detected

Population served record for Pine Ridge Water System

EPA SDWIS lists 7,482 people served and 1,151 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.

EPA SDWIS · PWS 084690475

Sources: EPA SDWIS

Nationwide peers

114 violations · 7,482 served: nearest cross-state SDWIS matches.

Cross-state systems with comparable violation load

Nearest cross-state community systems (500+ served) by total SDWIS violations on record.

4 peers

Cross-state systems with similar served population

Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).

4 peers

What to do with Pine Ridge Water System

Use this system's EPA-reported record as a starting filter, not a final verdict.

See how every tracked system in EPA Region 8 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 8 — Tribal Water Systems systems
Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
Find and compare another public water system by name or PWSID. Search systems

EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Compiled by PlainWater, Drinking Water Quality Editorial Process · May 15, 2026

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.